Qualification: 
Ph.D, M.Tech, B-Tech
kj_narayanan@cb.amrita.edu

Dr. Jayanarayanan K. currently serves as Professor at the Department of Chemical Engineering, School of Engineering. Coimbatore.

AFFILIATIONS

QUALIFICATIONS

YEAR DEGREE/PROGRAM INSTITUTION
2011 Ph. D., Thesis title: Studies on Microfibrillar based Composites) Mahatma Gandhi University, India
2002 M. Tech. in Polymer Science and Engineering  Anna University, India
1991 B. Tech. (Mechanical Engineering) University of Calicut, India 

PROFESSIONAL MEMBERSHIP

  • Life Member, Indian Society for Advancement of Materials and Process Engineering (ISAMPE)
  • Life Member, Indian Society for Technical Education (ISTE)
  • Life Member, Society for Failure Analysis
  • Member, Indian Institute of Chemical Engineers

RESEARCH INTERESTS

Development of insitu polymer-polymer composites from thermoplastics

A new class of fiber reinforced composites called microfibrillar composites (MFCs) are prepared from two fiber forming thermoplastic polymers. The reinforcing elements are created in situ during the manufacturing process. MFC technology provides an excellent method to make use of commingled plastics in which both low melting temperature general plastics and high melting temperature engineering plastics co-exist. In the work from our group, the properties of MFCs prepared from polypropylene (PP)/ polyethylene terephthalate (PET) and low density polyethylene (LDPE)/PET blends are being analyzed. The static and dynamic mechanical, solvent sorption, and thermal degradation properties of the microfibrillar blends/composites are found to be superior to conventional LDPE/PET blends. MFCs can be prepared with electrically conductive functionalization by making use of conductive fillers. Anisotropically conductive polymer composites can be prepared using this technique. MFC based films are expected to exhibit improved barrier properties qualifying them to be used for packaging applications. MFCs provide an excellent route for the mechanical recycling of fiber forming thermoplastics.

Development and Characterization of Hybrid and Nanocomposites

  • Polymer Nanocomposites for Inflatable Space Structures

    Flexible  laminates are prepared  from  different  types  of  PET  films  and  UHMWPE (Dyneema)  fabric  using  polyurethane  based  adhesive.  Peel strength, Lap  shear  strength and  barrier properties are common objectives.  The  effect  of  plasma  treatment  of Dyneema  fabric  on the adhesion  properties  are  analyzed. The incorporation of the nanofillers in the adhesive and its effect on the flexible laminate properties are studied.

  • Metal /Poly Ether Ether Ketone Hybrid Composite Laminates for Nuclear Waste Storage Containers

    Our work includes analysis of the effectiveness of PEEK based laminates for nuclear waste storage applications, which have the best of properties, are low in cost, and are relatively easy to fabricate. We also study incorporating radiation resistant nanofillers like boron carbide and tungsten carbide in PEEK matrix by melt compounding. Subsequently surface modified steel is laminated with PEEK nanocomposite plates. The other objective is comparison of radioactive waste storage properties of the above mentioned laminates by bench marking with the conventionally used materials.

Optimization of Polymer Processing Techniques especially Injection Moulding and Extrusion

The quality of the products made by extrusion and injection moulding depends on machine (process) and material parameters. Design of experiments methods are employed to optimize these parameters to achieve the required properties for the products. Some of the work being carried out in this area is listed below.

  • Impact  modification of of Acrylonitrile Butadiene Styrene for car bumper applications
  • Optimization of scrap usage in rigid PVC pipe extrusion process
  • Optimization of process parameters of an injection moulded gear to reduce warpage and shrinkage

Publications

Publication Type: Journal Article

Year of Conference Publication Type Title

2018

Journal Article

N. Rasana, Malavika, D., Aparna, R., Deepak, T., Haritha, P. S., and Dr. Jayanarayanan K., “Influence of multiphase fillers on the mechanical, transport and rheological properties of Polypropylene”, Materials Today Proceedings (Scopus), vol. 5, no. 8, Part 3, pp. 16478-16486, 2018.[Abstract]


Recently increasing importance has been paid to nano level reinforcements in composites as they can significantly improve the properties at very low level of loading. This study is focused to detail the synergistic effect of micro (glass fibre) and nano (nanosilica) fillers in polypropylene (PP) matrix. A significant increase of 26% in the tensile strength and a notable increase in storage modulus and complex viscosity was observed for the hybrid composite. It is seen that the network structure developed by the localization of nanosilica around glass fiber in PP matrix offered an exigent path for solvent penetration.

More »»

2018

Journal Article

A. Jenifer, Rasana, N., and Dr. Jayanarayanan K., “Synergistic effect of the inclusion of glass fibers and halloysite nanotubes on the static and dynamic mechanical, thermal and flame retardant properties of polypropylene”, Materials Research Express, vol. 5, no. 6, p. 065308, 2018.[Abstract]


Hybrid composites based on polypropylene (PP), glass fiber (GF) and halloysite nanotubes (HNT) were prepared in the presence of a compatibilizer, polypropylene grafted with maleic anhydride (PP-g-MAH), in a twin screw extruder. The properties of the micro composite (PP/GF), nanocomposite (PP/HNT) and hybrid composite (PP/GF/HNT) were studied and compared. The dispersion of the fillers in the base matrix and the effectiveness of the compatibilizer were ascertained by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) and fourier transform infrared spectroscopy (FTIR). The tensile strength and modulus of the hybrid composite prepared in the presence of PP-g-MAH were found to be superior to those of the compatibilized micro and nanocomposites. Differential scanning calorimetry gave insight to the effect of the fillers on modifying the crystallization behavior of the base polymer. The combination of GF and HNT increased the crystallization temperature of PP phase in all the composites. The dynamic mechanical analysis proved that the fillers introduced in the polymer matrix restricted the relaxation of the PP polymer chains as evidenced by the rise in the glass transition temperature (T g ). The thermal stabilities of the hybrid composites were far superior to the neat polymer as the fillers formed an insulating layer delaying the degradation tendency and elevated the activation energy. The flammability of PP could be modified tremendously by the incorporation of the fillers as they reduced the burning rate and raised the limiting oxygen index values.

More »»

2018

Journal Article

N. Rasana and Dr. Jayanarayanan K., “Experimental and micromechanical modeling of fracture toughness”, Journal of Thermoplastic Composite Materials, 2018.[Abstract]


In this study, polypropylene-based nano and hybrid composites are prepared with 20 wt% glass fiber and multiwalled carbon nanotubes (MWCNTs) ranging up to 5 wt%. The multiaxial stress fields developed during external loading of composites cause crack propagation by various fracture mechanisms. Among the nanocomposites, it is observed that the critical stress intensity factor (KI) is highest for the one prepared at 3 wt% loading of MWCNTs. The synergistic effect of multiscale fillers in hybrid composite with MWCNT content of 3 wt% results in superior fracture toughness properties as evidenced by 16.6% increase in KI with respect to neat PP. Analytical expressions that take into account the fracture mechanisms like particle debonding and matrix yielding are employed to estimate the composite crack resistance and then compared with experimentally obtained fracture toughness properties. The fracture toughness properties are found to be dependent on composition of fillers, matrix yield strain, and debonding strain of the composites.

More »»

2018

Journal Article

M. Remanan, Shantanu Bhowmik, Varshney, L., and Dr. Jayanarayanan K., “Tungsten carbide, boron carbide and MWCNT reinforced polyaryl ether ketone nanocomposites: Morphology and thermomechanical behavior”, Journal of Applied Polymer Science, p. 47032, 2018.[Abstract]


This study involves the development and thermo-mechanical characterization of the individual, binary, and ternary nanocomposites using radiation resistant fillers like boron carbide (B4C), tungsten carbide (WC), and functionalized multi-walled carbon nanotubes (F-MWCNT) in a high performance polymer, namely, poly aryl ether ketone (PAEK). Transmission electron microscopy studies revealed the distribution and dispersion of nanofillers in the matrix. It has been observed that the presence of WC and F-MWCNT in PAEK matrix significantly enhanced the tensile strength of the composite whereas B4C made it stiff and brittle in nature. The tensile property improvement caused by WC and F-MWCNT has been correlated with the tensile fracture surface morphology studies. Dynamic mechanical analysis provided insight into the positive effect of nanofillers in delaying the relaxation of polymer chains. The thermogravimetric analysis gave indications on the increase in the thermal stability of the nanocomposites with the increase of nanofillers content.

More »»

2018

Journal Article

M. Remanan, Shantanu Bhowmik, Lalit Varshney, and Dr. Jayanarayanan K., “Poly(aryl ether ketone) based individual, binary and ternary nanocomposites for nuclear waste storage: Mechanical, rheological and thermal analysis”, Materials Research Express, 2018.[Abstract]


Abstract In this study poly aryl ether ketone (PAEK) based nanocomposites containing multi walled carbon nanotubes, boron carbide and tungsten carbide nanofillers were irradiated with gamma rays of dosage 5000 kGy. These composites were prepared to estimate their potential in nuclear waste storage applications. The tensile properties, non destructive testing, rheological behavior and thermal properties of the composites were evaluated before and after gamma irradiation. The property variation after irradiation was influenced by the cross linking and chain scission of the polymer developed within the nanocomposites. In the tensile property analysis, the tensile modulus and the percentage elongation at break of all the nanocomposites were modified after gamma irradiation. Non destructive testing (NDT) showed all the samples were free from voids and cracks after gamma rays exposure. There was a slight decrease in the complex viscosity of the samples after irradiation indicating the predominance of the chain scission over cross linking. The decrease in melting temperature and the crystallization temperature of PAEK and the nanocomposites after irradiation suggested changes in the conformation of the polymer chains which was validated by the gel permeation chromatography (GPC) analysis. Even though the properties of the virgin PAEK were significantly reduced after gamma irradiation, the percentage reduction in the properties of polymer nanocomposites was not considerable especially with the ones reinforced with tungsten carbide.

More »»

2017

Journal Article

Aa Padanattil, Dr. Jayanarayanan K., and Dr. Mini K. M., “Novel hybrid composites based on glass and sisal fiber for retrofitting of reinforced concrete structures”, Construction and Building Materials, vol. 133, pp. 146-153, 2017.[Abstract]


In this work an attempt has been made to assess the efficacy of hybrid composite system as a potential choice for the retrofitting of reinforced concrete structures. The combination of synthetic and natural fibers are used for the external confinement of concrete cylinders. A comparative performance analysis of hybrid sisal-glass fiber reinforced polymer (HSGFRP) confinement vis a vis carbon fiber reinforced polymer (CFRP), glass fiber reinforced polymer (GFRP) and sisal reinforced polymer (SFRP) individual confinement is carried out. The axial compressive behaviour, stress-strain response and energy absorption characteristics are studied. The inclusion of sisal fibers along with glass fiber is found to improve the energy absorption characteristics. For predicting the ultimate strength of HSGFRP confined concrete, a new equation was developed based on the lateral confining pressure which shows good agreement with the experimental results. Durability performance studies indicated that exposure to wet/dry conditions and temperature variations resulted an increase in strength for all FRP confined specimens and whereas it decreased for unconfined ones. © 2016 Elsevier Ltd

More »»

2017

Journal Article

B. L. P. Dheeraj Swamy, Raghavan, V., Srinivas, K., K Rao, N., Lakshmanan, M., Dr. Jayanarayanan K., and Dr. Mini K. M., “Influence Of Silica Based Carbon Nano Tube Composites In Concrete”, Advanced Composites Letters, vol. 26, no. 1, pp. 12-17, 2017.[Abstract]


This study focuses on the utilization of highly densified materials in cementitious composites with objectives of improving the mechanical performance and minimizing the number and size of defects. Due to their excellent mechanical properties, carbon nanotubes (CNTs) are now viewed as potential candidate for reinforcement in cement composites. The present paper reports the use of carbon nanotubes (CNTs) as reinforcement to improve the mechanical properties of portland cement paste and creating multifunctional concrete. In order to increase the bonding, and strength, a material with intermediate fineness, highly densified silica fumes, was also utilized. The densified silica fumes along with CNT are added to cement mortar in various proportions. Small-scale specimens were prepared to measure the mechanical properties as a function of nanotube concentration and distribution. Furthermore, properties like shrinkage, permeability and alkalinity of the resultant composite were also investigated. The study addresses the significance of CNT as an additive to the enhancement of properties of cement composite. More »»

2017

Journal Article

M. Remanan, Dr. Kannan M., Rao, R. Subba, Shantanu Bhowmik, Lalit Varshney, Mathew Abraham, and Dr. Jayanarayanan K., “Microstructure Development, Wear Characteristics and Kinetics of Thermal Decomposition of Hybrid Nanocomposites Based on Poly Aryl Ether Ketone, Boron Carbide and Multi Walled Carbon Nanotubes”, Journal of Inorganic and Organometallic Polymers, pp. 1–15, 2017.[Abstract]


In the present study a high performance polymer poly aryl ether ketone (PAEK) is reinforced with micro and nano boron carbide (B4C) and functionalized multi walled carbon nanotubes (F-MWCNT) to investigate the individual and hybrid effect of the fillers. Optical microscopy and transmission electron microscopy suggested the dispersion of micro and nano fillers respectively in PAEK matrix. The inclusion of B4C nano fillers increased the hardness of the composites which aided the wear resistance of the composites. The morphological features of the worn surface of the samples are analyzed using scanning electron microscopy. It is found from the izod impact test analysis that the impact strength of the composite enhanced by the F-MWCNT inclusion. The thermal properties of PAEK in the composites are studied using differential scanning calorimetry and it revealed dominant effect of F-MWCNT influencing the thermal transitions than the B4C particles. The kinetics of thermal degradation of various composites is analyzed using Coats–Redfern method. The positive influence of B4C in the matrix indicates that the thermal degradation is delayed due to the higher activation energy it possesses. The overall results shows that the hybrid nanocomposite exhibits better properties compared to individual micro and nano composites.

More »»

2017

Journal Article

N. Rasana and Dr. Jayanarayanan K., “Polypropylene/short Glass Fiber/nanosilica Hybrid Composites: Evaluation of Morphology, Mechanical, Thermal, and Transport Properties”, Polymer Bulletin IF:1.430, pp. 1-19, 2017.[Abstract]


In this work, the effect of incorporation of glass fiber and nanosilica separately and in combination in a thermoplastic matrix is investigated. Individual micro, nano, and hybrid multiphase composites based on polypropylene were prepared via twin screw extrusion followed by injection molding. The glass fiber content was maintained at 10 wt{%} and nanosilica level was fixed at 4 wt{%}. The microstructure of the hybrid composite indicated the presence of nanosilica surrounding the glass fibers. Higher tensile strength and modulus was reported for hybrid composite, followed by micro and nanocomposite. The differential scanning calorimetry studies suggested that the presence of glass fibers could hasten the crystallization of PP in comparison with nanosilica. The thermal degradation studies for hybrid composite exhibited a prominent thermal stability. The delayed diffusion of solvent in hybrid composite was observed due to the confinement regions generated by the combination of micro and nanofillers.

More »»

2016

Journal Article

Dr. Jayanarayanan K., Thomas, Sb, and Joseph, Kc, “Effect of blend ratio on the dynamic mechanical and thermal degradation behavior of polymer–polymer composites from low density polyethylene and polyethylene terephthalate”, Iranian Polymer Journal (English Edition), vol. 25, pp. 373-384, 2016.[Abstract]


Microfibrillar polymer–polymer composites (MFCs) based on low-density polyethylene (LDPE) and polyethylene terephthalate (PET) were prepared by cold drawing-isotropization technique. The weight percentage of PET was varied from 5 to 45 %. Microfibrils with uniform diameter distribution were obtained at 15 to 25 wt% of PET as evident from the scanning electron microscopy (SEM) results. Dynamic mechanical properties such as storage modulus (E′), loss modulus (E″) damping behavior (tan δ) were examined as a function of blend composition. The E′ values were found to be increasing up to 25 wt% of PET. An effort was made to model the storage modulus and damping characteristics of the MFCs using the classical equations used for short-fiber reinforced composites. The presence of PET microfibrils influenced the damping characteristics of the composite. The peak height at the β-transitions of loss modulus was lower for MFCs with 25 % PET, showing that they had superior damping characteristics. This phenomenon could be correlated with the PET microfibrils morphology. The thermal degradation characteristics of LDPE, neat blends and microfibrillar blends (MFBs) were compared. The determination of activation energy for thermal degradation was carried out using the Horowitz and Metzger method. The activation energy for thermal degradation of microfibrillar blends was found to be higher than that for the corresponding neat blends and MFCs. The long PET microfibrils present in MFBs could prevent the degradation and enhance the activation energy. © 2016, Iran Polymer and Petrochemical Institute.

More »»

2016

Journal Article

M. Remanan, Rao, R. S., Shantanu Bhowmik, Lalit Varshney, Mathew Abraham, and Dr. Jayanarayanan K., “Hybrid Nanocomposites based on poly aryl ether ketone, boron carbide and multi walled carbon nanotubes: Evaluation of thermo mechanical properties”, E-Polymers, vol. 16, pp. 493-503, 2016.[Abstract]


In this study an attempt has been made to incorporate a radiation resistant filler like boron carbide (B4C) nanopowder along with multi walled carbon nanotubes (MWCNT) in a high performance polymer namely poly aryl ether ketone (PAEK) for potential applications in the nuclear industry. The dispersion of nanofillers in PAEK was established by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Infra red (IR) spectroscopy indicated the interaction between functionalized MWCNT (F-MWCNT) and PAEK. The optimum combination of B4C and F-MWCNT was obtained from the tensile property analysis. It was found from the dynamic mechanical analysis that the storage modulus of the composite at elevated temperature was enhanced by B4C inclusions. Mechanical damping factor spectra showed the shift of PAEK glass transition temperature to higher values due to the presence of B4C and F-MWCNT. Thermogravimetric analysis (TGA) presented the resistance offered by B4C to the degradation of PAEK especially at elevated temperatures.

More »»

2015

Journal Article

Dr. Jayanarayanan K., Thomas, S., and Joseph, K., “Effect of compatibilizer on the morphology development, static and dynamic mechanical properties of polymer-polymer composites from LDPE and PET”, International Journal of Plastics Technology, pp. 1–22, 2015.[Abstract]


The morphology development and mechanical properties of low density polyethylene (LDPE)/ poly ethylene terephthalate (PET) blends and microfibrillar composites (MFC) at varying concentrations of a compatibilizer polyethylene grafted with maleic anhydride (PE-g-MA) were analyzed in this study. The microstructure of the microfibrillar blends (MFBs) and composites during the various stages of their preparation was characterized using scanning electron microscopy (SEM). The aspect ratio of the PET microfibrils was found to increase with compatibilizer loading up to an optimum level. The presence of 4 wt% PE-g-MA affected the dimensions of the PET fibrils differently in 75/25 and 85/15 w/w% microfibrillar blends. The variation in the length of the microfibrils was found to influence the static and dynamic mechanical properties of the microfibrillar composites. The studies pointed towards the necessity of optimizing the compatibilizer concentration to achieve enhanced properties for the MFCs.

More »»

2012

Journal Article

Dr. Jayanarayanan K., Thomas, Sb, and Joseph, Kc, “Effect of blend ratio on the mechanical and sorption behaviour of polymer-polymer microfibrillar composites from low-density polyethylene and polyethylene terephthalate”, Journal of Reinforced Plastics and Composites, vol. 31, pp. 549-562, 2012.[Abstract]


The morphology of the neat blends, microfibrillar blends and the corresponding microfibrillar composites based on low-density polyethylene and polyethylene terephthalate was analyzed. As the polyethylene terephthalate concentration increased, an increase in the diameter of polyethylene terephthalate spheres/fibrils was observed. The fibrils with relatively uniform diameter distribution were obtained in the range of 15-25 wt% polyethylene terephthalate concentration. The tensile properties of the blends and microfibrillar composites increased with polyethylene terephthalate concentration up to an optimum level. The neat blends exhibited inferior tensile properties in comparison with the microfibrillar composites. As the polyethylene terephthalate concentration increased, the solvent uptake reduced. The diffusivity and permeability of the microfibrillar composites were lower than the corresponding blends. The solvent uptake was found to be lowest for the composite with 25 wt% polyethylene terephthalate concentration. The polyethylene terephthalate microfibrils in the microfibrillar composites offered a tortuous path for the diffusion of the solvent. © The Author(s) 2012.

More »»

2012

Journal Article

Gac George, Jose, EaTomlal, Dr. Jayanarayanan K., Nagarajan, E. Rc, Skrifvars, Md, and Joseph, Ke, “Novel bio-commingled composites based on jute/polypropylene yarns: Effect of chemical treatments on the mechanical properties”, Composites Part A: Applied Science and Manufacturing, vol. 43, pp. 219-230, 2012.[Abstract]


<p>This paper mainly investigates the fabrication process of jute yarn reinforced, bidirectional thermoplastic commingled composites (both untreated and treated). Commingling method was used to prepare the composites wherein the Polypropylene yarn (PP yarn) and jute yarn were wound together onto a metal plate in a particular configuration and then compression moulded. The mechanical properties of the composites prepared from chemically treated jute yarn were found to increase substantially compared to those of untreated ones. The surface morphologies of the fracture surfaces of the composites were recorded using scanning electron microscope (SEM). The SEM micrographs reveal that interfacial bonding between the treated jute yarn and the matrix has improved significantly by chemical treatments. The various chemical treatment mechanisms have been supported by FT-IR spectra. Theoretical modelling was used to predict the tensile properties and was found to be in accordance with the experimental results. © 2011 Elsevier Ltd. All rights reserved.</p>

More »»

2011

Journal Article

Dr. Jayanarayanan K., Thomas, S., and Joseph, K., “In situ microfibrillar blends and composites of polypropylene and poly (ethylene terephthalate): Morphology and thermal properties”, Journal of polymer research, vol. 18, pp. 1–11, 2011.[Abstract]


Microfibrillar blends were prepared from polypropylene and poly (ethylene terephthalate) by extrusion followed by cold drawing. The draw ratio employed had a prominent effect on the aspect ratio of the microfibrils produced, as revealed by scanning electron microscopy. The subsequent isotropization step between the Tm of the polymers created microfibrillar composites with randomly oriented short microfibrils of poly (ethylene terephthalate). The X ray diffraction patterns of the microfibrillar blends were different from those of corresponding composites although the polypropylene phase in both exhibited predominantly the presence of α crystallites. The crystallization of the polypropylene phase was affected by the orientation and diameter of the poly (ethylene terephthalate) microfibrils. The short microfibrils in the microfibrillar composites were not effectual in hastening the crystallization of polypropylene. The thermal decomposition studies revealed the capability of microfibrillar blends to delay the degradation better than the microfibrillar composites.

More »»

2010

Journal Article

T. Ea Jose, Thomas, P. Ca, Dr. Jayanarayanan K., Mathew, Jc, and Joseph, Kd, “Solvent uptake and accelerated solar aging studies of cotton - Polypropylene commingled composite systems”, Polymers and Polymer Composites, vol. 18, pp. 103-112, 2010.[Abstract]


Natural fibre-reinforced thermoplastic composites have a significant role in non-structural applications. Natural fibres are biodegradable, renewable and of low cost, high toughness and possess good thermal properties. This work involved the study of solvent absorption of cotton/polypropylene (PP) side-by-side commingled composites in different solvents, its variation by chemical treatments, temperature, fibre content etc., the extent of tensile property deterioration by solar radiation in a solar light concentrator and by water diffusion. It was observed that though cotton is highly hydrophilic, the diffusion was a matrix-dominated phenomenon. The extent of moisture absorption increased with the fibre content but decreased on treatment with maleic anhydride-modified PP. The former added a greater number of hydrophilic hydroxyl groups while the latter consumed them and enhanced the fibre-matrix interfacial adhesion. Increase in temperature accelerated the rate of moisture absorption and reduced the time required for equilibrium swelling. Exposure to sunlight in solar concentrator deteriorated mechanical properties such as tensile strength and tensile modulus by weakening the fibre-matrix interfacial adhesion and by chain scission. © Smithers Rapra Technology, 2010.

More »»

2010

Journal Article

E. Ja Tomlal, Thomas, P. Ca, George, K. Ca, Dr. Jayanarayanan K., and Joseph, Kc, “Impact, tear, and dielectric properties of cotton/polypropylene commingled composites”, Journal of Reinforced Plastics and Composites, vol. 29, pp. 1861-1874, 2010.[Abstract]


Natural fibers can be used as reinforcements in thermoplastic non-structural applications. Commingling them with matrix fibers lowers the melt flow distance of molten matrix during the processing. In this study, polypropylene (PP) and textile cotton fibers were commingled and fabricated to composite laminates. Process variables like temperature, pressure, and holding time affect the mechanical properties like impact strength and tear resistance. Fiber content and winding pattern or fiber orientation were also important for the optimization of the mechanical properties. The modification of the interface by chemical treatments of the matrix or reinforcement with reagents like potassium permanganate, benzoyl peroxide, and maleic anhydride modified PP enhances some mechanical properties like tear strength of cotton fiber-reinforced PP commingled composite systems. Fiber content, treatments, and moisture also varies dielectric constant and volume resistivity. © The Author(s), 2010.

More »»

2010

Journal Article

Dr. Jayanarayanan K., Ravichandran, A., Rajendran, D., Sivathanupillai, M., Venkatesan, A., Thomas, S., and Joseph, K., “Morphology and mechanical properties of normal blends and in-situ microfibrillar composites from low-density polyethylene and poly (ethylene terephthalate)”, Polymer-Plastics Technology and Engineering, vol. 49, pp. 442–448, 2010.[Abstract]


In this work, normal blends, microfibrillar blends and composites were prepared from low density polyethylene (LDPE) and poly(ethylene terephthalate) (PET) in 85/15 and 75/25 w/w% ratio in the presence and absence of a compatibilizer polyethylene grafted with maleic anhydride (PE-g-MA). The microfibrillar composites (MFCs) were prepared using extrusion - drawing - isotropization technique. The morphology development of the microfibrillar blends and composites was studied using scanning electron microscopy (SEM). The presence of 5 wt% PE-g-MA compatibilizer affected the continuity of the fibrils differently in 75/25 and 85/15w/w% microfibrillar blends. In the case of normal blends the addition of compatibiliser reduced the size of the dispersed PET phase. The presence of PET microfibrils improved the tensile properties of the microfibrillar composites. The normal blends exhibited a relatively ductile failure during tensile loading in comparison with the microfibrillar composites. The microfibrillar nature of the dispersed phase was found to improve the stiffness of the composite rather than their impact strength.

More »»

2009

Journal Article

Dr. Jayanarayanan K., Thomas, S., and Joseph, K., “Dynamic mechanical analysis of in situ microfibrillar composites based on PP and PET”, Polymer-Plastics Technology and Engineering, vol. 48, pp. 455–463, 2009.[Abstract]


Microfibrillar composites (MFCs) based on polypropylene and poly (ethylene terephthalate) were prepared by a three step process namely blending (extrusion), fibrilization (drawing) and isotropization, using different draw ratios (viz. 2, 5, 8 and 10). The drawn (stretched) blend was injection moulded at a temperature between the melting points of the two polymers, leading to isotropization. During this step PET microfibrils got randomly distributed in an isotropic PP matrix to complete the formation of microfibrillar in situ composites. The dynamic mechanical properties such as storage modulus (E′), loss modulus (E″) and mechanical loss factor (tan δ) of PP, neat blend and in situ composites were investigated. The E′ values were found to increase up to a stretch ratio of 8. The glass transition temperature (Tg) of PP in the MFC was found to shift to higher values with an increase in stretch ratio. The presence of microfibrils showed a positive effect on the modulus at temperatures above Tg of PP, especially for the samples drawn at stretch ratio 5 and 8. The tan δ and E″ modulus spectra indicated a strong influence of the microfibrils on the magnitude of α and β relaxations of PP. The effect of test frequency on storage modulus, loss modulus and tan δ was studied.

More »»

2009

Journal Article

Dr. Jayanarayanan K., Jose, T., Thomas, S., and Joseph, K., “Effect of draw ratio on the microstructure, thermal, tensile and dynamic rheological properties of insitu microfibrillar composites”, European Polymer Journal, vol. 45, pp. 1738–1747, 2009.[Abstract]


Microfibrillar composites (MFCs) were prepared using different draw/stretch ratios [viz. 2, 5, 8 and 10] from polypropylene/polyethylene terephthalate (PP/PET) blends. Scanning electron microscopy [SEM] images revealed that PET microfibrils were highly oriented after melt blending and drawing. After the conversion of drawn (stretched) blends to MFCs the PET microfibrils were found to be randomly distributed in the PP matrix. The tensile strength and modulus of the MFCs were found to be higher for the samples drawn at stretch ratios 5 and 8 on account of the long PET microfibrils they possessed. The non isothermal crystallization behaviour of the neat blend (as extruded), stretched blend and the MFC was compared. The oriented PET fibrils in the stretched blend were found to have a greater nucleating effect for the crystallization of PP than the spherical PET particles in the neat blend and randomly oriented short PET fibrils in the MFC. Dynamic rheology studies indicated the storage modulus and loss modulus of MFCs were enhanced as draw ratio increases up to an optimized level beyond which they decrease. When the draw ratio increased up to the optimized level the MFCs tended to be more viscous, especially at low frequency, whereas further increasing the draw ratio resulted in a decrease in the complex viscosity. The microfibrils of PET in the MFC were found to perturb the relaxation of molten PP matrix. © 2009 Elsevier Ltd. All rights reserved.

More »»

2009

Journal Article

Dr. Jayanarayanan K., George, G., Thomas, S., and Joseph, K., “Morphology Development of Normal Blends, Microfibrillar Blends and Composites from LDPE and PET”, SB Academic Review, vol. XVI, pp. 66-76, 2009.[Abstract]


In this work, the morphology of the normal blends, microfibrillar blends and the corresponding microfibrillar composites based on low density polyethylene and poly ethylene terephthalate was analysed. The effect of poly ethylene terephthalate concentration on the size of the dispersed phase was studied. With the increase in PET concentration an increase in the diameter of poly ethylene terephthalate spheres/ fibrils was observed. The poly ethylene terephthalate fibrils with relatively uniform diameter distribution was obtained for 85/15 and 75/25 w/w% blends. The increase in poly ethylene terephthalate concentration developed co continuous morphology in the case of normal blends. The fibrillar morphology of poly ethylene terephthalate was perturbed at its higher concentrations in the case of microfibrillar composites.

More »»

2008

Journal Article

Dr. Jayanarayanan K., Thomas, S., and Joseph, K., “Mechanical and thermal properties of microfibrillar polymer-polymer composites”, Journal of Polymer Materials, vol. 25, pp. 381–386, 2008.[Abstract]


Microfibrillar polymer-polymer composites were prepared by melt blending of polypropylene (PP) and poly (ethylene terephthalate) (PET). The blending of the polymers was carried out in a single screw extruder, followed by continuous drawing at a stretch (draw) ratio 5. The stretched blend was converted into polymer-polymer composite by injection moulding carried out at temperatures between the melting points of PP and PET. Morphology analysis revealed that the extruded neat blend was isotropic, whereas the stretched blend possessed highly oriented fibrils generated in situ during drawing. The PET fibrils were found to be randomly distributed in the PP matrix of the polymer-polymer composite obtained. The mechanical properties of the injection moulded neat blend and polymer-polymer composite were compared. The tensile and impact properties of the composite were found to be considerably higher than that of the neat blend. The non isothermal crystallization behaviour of the neat blend, stretched blend and the polymer-polymer composite was compared. The oriented PET fibrils in the stretched blend were found to have a greater nucleating effect for the crystallization of PP than the spherical PET particles in the neat blend and randomly oriented short PET fibrils in the polymer-polymer composite.

More »»

2008

Journal Article

Dr. Jayanarayanan K., Thomas, S., and Joseph, K., “Morphology, static and dynamic mechanical properties of in situ microfibrillar composites based on polypropylene/poly (ethylene terephthalate) blends”, Composites Part A: Applied Science and Manufacturing, vol. 39, pp. 164–175, 2008.[Abstract]


In situ composites based on blends of polypropylene (PP) and poly (ethylene terephthalate) (PET), were prepared by melt extrusion, followed by continuous drawing and isotropization. The blending of the mixture was carried out in a single screw extruder and the isotropization of the stretched blend was achieved by injection moulding. Scanning electron microscopy (SEM) studies showed that the extruded blends were isotropic, but both phases became highly oriented after drawing (stretching). The stretched blends were converted into in situ composites after injection moulding at temperatures below the melting point of PET. The size of the PET fibrils generated decreased with increasing stretch ratio. The tensile and impact properties were found to be higher for the samples drawn at stretch ratios 5 and 8. Dynamic mechanical properties such as the storage modulus (E′), loss modulus (E″) damping behavior (tan δ) and static mechanical properties were investigated as a function of stretch ratio. The E′ values were found to be increasing up to a stretch ratio 8. The tan δ and E″ modulus spectra showed a strong influence of the microfibrils on the α and β relaxation of PP. Finally, the tensile properties obtained experimentally were compared with those determined using theoretical equations.

More »»

2008

Journal Article

Dr. Jayanarayanan K., Bhagawan, S. S., Thomas, S., and Joseph, K., “Morphology development and non isothermal crystallization behaviour of drawn blends and microfibrillar composites from PP and PET”, Polymer Bulletin, vol. 60, pp. 525–532, 2008.[Abstract]


Microfibrillar composites (MFC) were prepared from the blends of polypropylene (PP) and poly (ethylene terephthalate) (PET) at a fixed weight ratio of 85/15. The blending of the mixture was carried out in a single screw extruder, followed by continuous drawing at a stretch (draw) ratio 5. The stretched blends were converted into MFC by injection moulding. Scanning electron microscopy (SEM) studies showed that the extruded blends were isotropic, but both phases possessed highly oriented fibrils in the stretched blends, which were generated insitu during drawing. The PET fibrils were found to be randomly distributed in the PP matrix after injection moulding. The non isothermal crystallization behaviour of the as extruded blend, stretched blend and MFC was compared. The analysis of the crystallization temperature and time characteristics revealed that the PET fibrils in the stretched blend had a greater nucleating effect for the crystallization of PP than the spherical PET particles in the as extruded blend and short PET fibrils in the MFC.

More »»

Publication Type: Book Chapter

Year of Conference Publication Type Title

2017

Book Chapter

Dr. Jayanarayanan K., Rasana, N., and Mishra, R. Kumar, “Dynamic Mechanical Thermal Analysis of Polymer Nanocomposites”, in Thermal and Rheological Measurement Techniques for Nanomaterials Characterization- (3 volume series) (Scopus), edited by Sabu Thomas, Raghvendra kumar Mishra ,Raju Thomas and Ajesh K. Zachariah, Elsevier Publications, 2017, pp. 123–157.[Abstract]


The objective of this chapter is to establish the use of dynamic mechanical thermal analysis in characterizing polymer nanocomposites. Dynamic mechanical analysis is a powerful tool employed to comprehend thermal transitions of viscoelastic materials by characterizing the evolution of their macromolecular relaxation as a function of temperature and loading frequency. The presence of nanofillers perturbs the relaxation of the polymer chains affecting the stiffness, rigidity, and energy absorbing capability of polymeric materials. The modifications in the viscoelastic behavior of the polymers with the inclusion of nanofillers can be effectively studied from the storage/loss moduli and damping factor spectra obtained from this analysis. In this chapter, the potential of dynamic mechanical thermal analysis is assessed by focusing on the ability of the technique to offer information not only on the viscoelastic performance of filled thermoplastic, thermosets, and elastomeric materials, but also on the miscibility and interface strengthening of polymer blends with nanoinclusions. The various theoretical equations used for modeling dynamic mechanical properties of polymer nanocomposites are discussed in detail.

More »»

2017

Book Chapter

Dr. Jayanarayanan K., Thomas, S., Joseph, K., and Mishra, R. K., “Preparation, morphology, static and dynamic mechanical properties, and application of polyolefins and poly(ethylene terephthalate) based microfibrillar and nanofibrillar composites”, in Micro and Nano Fibrillar Composites (MFCs and NFCs) from Polymer Blends (A volume in Woodhead Publishing Series in Composites Science and Engineering), Elsevier Inc., 2017, pp. 183–211.[Abstract]


This chapter discusses the properties of micro and nanofibrillar composites prepared from blends of polyolefins and polyethylene terephthalate by a three-step protocol, namely melt extrusion, continuous drawing of extruded strands, followed by isotropization (annealing). These composites are unique in nature as the reinforcing fibrils are formed in situ during the melt blending process. The morphology development of the blends during each stage of preparation is analyzed by microscopic techniques. The static mechanical properties such as tensile strength, tensile modulus, elongation at break are examined. Dynamic mechanical properties analysis carried out gives information on the storage modulus, loss modulus, damping factor, and transition temperatures of in situ microfibrillar composites. The effect of draw ratio and blend ratio on the microstructure development is discussed in detail. The consequence of compatibilizer addition on the various properties of the in situ composites is reported. It is observed that an optimum draw ratio and blend ratio is imperative for maximizing the aspect ratio of the micro/nanofibrils which controls the strength and stiffness of the composite.

More »»

2017

Book Chapter

Dr. Jayanarayanan K., Mishra, R. K., .Abraham, J., Joseph, K., and Thomas, S., “Conducting Polyurethane Composites”, in Polyurethane Polymers: Composites and Nanocomposites, Elsevier Inc., 2017, pp. 365–399.[Abstract]


Conducting polyurethane-based nanocomposites have been identified as one of the promising class of materials which find considerable attractive applications in various fields, such as construction, packaging, automotive, aerospace, military, medical, and electrical and electronics. In this chapter various aspects of conducting polyurethane nanocomposites are addressed, starting with their fabrication and ending with their applications. This chapter discusses various conducting polyurethane nanocomposites reinforced with various conducting fillers, such as carbon black, carbon nanotube, and graphene and also discusses a large variety of applications of composites which include shape memory, actuator sensors, and electromagnetic interference shielding fields.

More »»

2017

Book Chapter

Dr. Jayanarayanan K., Mishra, R. K., .Abraham, J., Joseph, K., and Thomas, S., “Conducting Polyurethane Blends: Recent Advances and Perspectives”, in Polyurethane Polymers: Blends and Interpenetrating Polymer Networks, Elsevier Inc., 2017, pp. 203–231.[Abstract]


Polyurethane (PU) is a very important material with versatile properties. Melt blending of polyurethane with an intrinsic conducting polymer can improve the polyurethane properties such as electrical conductivity, corrosion protection, and electromagnetic shielding. The properties of blends are dependent upon the compatibility of the blend constituents. The main aim of this chapter is to explain the various properties and application of conducting polyurethane blends which are produced by mixing conducting polymers such as polyaniline, polypyrrole, or polythiophene with polyurethane. The rapid development of the new generation of electronic devices such as power sources, displays, and sensors requires intensive research on conducting polymer blends to improve the conductivity of insulating polymers and hence a wider application in fields such as electronics, electrical, automotive, aerospace, and the military.

More »»

2012

Book Chapter

Dr. Jayanarayanan K., “Microfibrils Reinforced Composites Based on PP and PET: Effect of Draw Ratio on Morphology, Static and Dynamic Mechanical Properties, Crystallization and Rheology”, in Synthetic Polymer–Polymer Composites, Edited by: Debes Bhattacharyya and Stoyko Fakirov , Munich, Germany: Carl Hanser Verlag GmbH & Co, 2012, pp. 437-461.[Abstract]


Microfibrillar composites (MFCs) are novel type of materials in which the reinforcing elements are polymer microfibrils of one or more homopolymers distributed anisotropically in an isotropic polymer matrix. The conspicuous feature of these types of composites is that both the matrix and the reinforcing phase are constituted by thermoplastic materials, which form partners to produce immiscible, fiber forming crystallizable microfibrillar blends (MFBs). Considering the size of the reinforcing elements, MFCs have an intermediate position between conventional fiber reinforced composites and molecular composites. In these types of blends, the required properties could be achieved by the careful selection of the component polymers (matrix and reinforcing elements) and their blend ratios. Fakirov, Evstatiev and coworkers [1–10] reported the pioneering work on this new type of polymeric materials. They made use of this technique: melt blending by extrusion, fibrillization of the blends by zone drawing and isotropization by annealing between the melting temperatures of the polymers involved to prepare polymer-polymer composites. Later on, Fakirov [11] introduced the concept of extrusion, on line drawing and isotropization using compression or injection molding to prepare MFCs. This technique was then used by several research groups [12–17] with their own variations in the drawing methodology adopted... More »»

2008

Book Chapter

Dr. Jayanarayanan K., “Compression, Transfer and Injection Moulding”, in Polymer Processing Technology, Editor: B.R.Gupta, 1st ed., New Delhi : Asian Books, 2008, pp. 16.1-16.37.

Publication Type: Conference Proceedings

Year of Conference Publication Type Title

2013

Conference Proceedings

S. S. Ashok, Krishnan, H., K.E., J., T., M., and Dr. Jayanarayanan K., “Mechanical and Sorption Behaviour of Sisal/Glass Reinforced Epoxy Hybrid Composites”, National conference on Recent Trends in Materials Science and technology (NCMST 2013). Thiruvananthapuram, pp. 122-124, 2013.

2010

Conference Proceedings

Dr. Jayanarayanan K., Thomasb, S., and Josephc, K., “Influence of cold drawing on the properties of microfibrillar structured insitu composites from PP and PET.”, International Conference on Advances in Polymer Technology (APT-10). Kochi, pp. 253-255, 2010.

2010

Conference Proceedings

Dr. Jayanarayanan K., Thomasb, S., and Joseph, K., “Influence of blend ratio on the mechanical and sorption behaviour of polymer - polymer microfibrillar composites from LDPE and PET”, International Conference on Recent Trends in Materials Science and Technology (ICMST-2010). Thiruvananthapuram, 2010.

2009

Conference Proceedings

Dr. Jayanarayanan K., Joseph, K., and Saritha, A., “Advances in polymer based micro and nano composites”, International conference on Innovative Technologies (ICIT-09). Haryana, pp. 30-39, 2009.

2009

Conference Proceedings

Dr. Jayanarayanan K., Thomas, S., Joseph, K., Dhivya, R., Archana, R., Monikumar, S., and Abirami, V., “Morphology and mechanical properties of in situ microfibrillar composites from LDPE and PET”, ISAMPE National Conference 2009 (INCCOM-8) Emerging Trends in Composite Materials and Technology. Thiruvananthapuram, pp. 74-81, 2009.

2009

Conference Proceedings

Dr. Saritha A., Joseph, K., and Dr. Jayanarayanan K., “Recent advances in polymer based micro and nanocomposites”, The International Conference on innovative technologies, ICIT -. 2009.

2007

Conference Proceedings

Dr. Jayanarayanan K., Thomas, S., and Joseph, K., “Microfibrillar In Situ Composites from Polymer Blends Morphology and Mechanical Properties Evaluation”, International and INCCOM-6 Conference Future Trends in Composite Materials and Processing. Indian Institute of Technology, Kanpur, pp. 122-127, 2007.

2006

Conference Proceedings

Dr. Jayanarayanan K., Bhagawan, S. S., Karthick, H. S., Suganya, V., and Shivashankari, A. L., “Optimization of Process Parameters of an Injection Moulded Gear Using Taguchi Method”, Annual Technical Conference (ANTEC 2006) organized by Society of Plastics Engineers. Charlotte, North Carolina, USA, pp. 1088-1092, 2006.[Abstract]


This paper suggests a systematic approach to reduce defects in injection moulded components. The component taken for analysis was an injection molded gear made of Stanyl (Nylon 4, 6)-15% Carbon Filled, used in an automobile. The analysis applies Taguchi Methodology to investigate the effects of process conditions on the shrinkage and warpage characteristics of the product made from a two cavity injection mould. The effect of seven process parameters on the Shrinkage and Warpage of the component were analyzed. An L18 standard orthogonal array (seven parameters with three levels) was chosen. The samples selected at random from each experiment were measured for warpage and shrinkage. The data thus obtained were analyzed with quality control tools like ANOVA (Analysis of Variance) and Factor Plots. Based on the results from ANOVA, the parameters which have significant effect on the quality of the product were identified. The factor plots gave information regarding the optimum levels of parameters to be maintained . The optimum levels of the parameters were used for conducting confirmatory experiments, which gave products with shrinkage and warpage within acceptable limits.

More »»

2006

Conference Proceedings

K. Joseph, Thomas, S., and Dr. Jayanarayanan K., “Development of In situ Composites from Polypropylene/Poly ethylene Terephthalate blends”, International Conference and Exhibition on Reinforced Plastics ICERP-2006. Chennai, 2006.

2006

Conference Proceedings

Dr. Jayanarayanan K., Shivashankari, A. L., Suganya, V., Karthick, H. S., and Bhagawan, S. S., “Optimisation of Process Parameters of an Injection Moulded Gear Using Taguchi Methodology”, International Conference on Resource Utilisation and Intelligent Systems INCRUIS-2006. Kongu Engineering College, Perundurai, Erode, pp. 3-7, 2006.

2006

Conference Proceedings

Dr. Jayanarayanan K., Joseph, K., Thomas, S., and A., V., “Morphology and Thermal Properties of Microfibrillar Composites”, Annual Technical Conference (ANTEC 2006) organized by Society of Plastics Engineers. Charlotte, North Carolina, USA , pp. 200-203, 2006.

2005

Conference Proceedings

Dr. Jayanarayanan K., S. Selvan, A., and Kumar, P. V. Rajesh, “Design Validation of Injection Moulded Automotive Plastic Part using Moldflow Analysis”, National seminar Advances in Engineering Design-2005. Bannari Amman Institute, Sathyamangalam, pp. 515-521, 2005.

2005

Conference Proceedings

Dr. Jayanarayanan K. and Bhagawan, S. S., “Design of Experiments in Polymer Technology”, 19th Rubber Conference. Mumbai, pp. 42-50, 2005.

2002

Conference Proceedings

Dr. Jayanarayanan K. and S., A. Selvan, “Flow Analysis of an Automotive Component using Mold flow”, International Conference Advances in Polymer Technology. Cochin University of Science and Technology, Cochin, pp. 145-151, 2002.

Publication Type: Book

Year of Conference Publication Type Title

2011

Book

Dr. Jayanarayanan K., Studies on in situ Microfibrillar Composites Based on Blends of Polyolefins and Polyester. LAP Lambert Academic Publishing, 2011.[Abstract]


This monograph discusses a new class of fiber reinforced composites called as microfibrillar composites(MFCs)prepared from two fibre forming thermoplastic polymers. MFC technology provides an excellent method to make use of commingled plastics in which both low melting temperature general plastics and high melting temperature engineering plastics co-exist. In this work, the properties of MFCs prepared from polypropylene (PP)/ polyethylene terephthalate (PET) and low density polyethylene (LDPE)/PET blends were analyzed. In the case of PP/PET MFCs the effect of draw ratio on the morphology, static and dynamic mechanical, thermal, rheological properties were studied. The MFCs prepared at the optimum draw ratio exhibited significant increase in the tensile and flexural moduli in comparison with the conventional blends. In LDPE/PET system, the effect of blend ratio and the effect of compatibilizer content on the properties of normal blends,microfibrillar blends and composites were evaluated. The static and dynamic mechanical, solvent sorption and thermal degradation properties of the microfibrillar blends/composites were found to be superior to conventional LDPE/PET blends.

More »»

Publication Type: Conference Paper

Year of Conference Publication Type Title

2011

Conference Paper

Dr. Jayanarayanan K., Thomas, S., and Joseph, K., “Microfibrillar Composites from Polymer Blends”, in First International Conference on Composites and Nanocomposites (ICNC 2011) organized by Center for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam, 2011.

2011

Conference Paper

Dr. Jayanarayanan K., Thomas, S., and Joseph, K., “Effect of Compatibilizer on the Morphology and Mechanical Properties of Novel Polymer - Polymer Composites from LDPE and PET”, in International Conference on Materials for Future (ICMF 2011), Government Engineering College, Trichur, 2011.

2009

Conference Paper

Dr. Jayanarayanan K., Dhanuja, M. T., Bhagawan, S. S., Divya, B., ,, and Nair, P. S., “Polymer nanocomposites for inflatable Space Structures:Property Optimization using Response Surface Methodology”, in Sixth International Conference on “Precision ,Meso,Micro and Nano Engineering, Coimbatore, 2009.

2008

Conference Paper

Dr. Jayanarayanan K., Bhagawan, S. S., Joseph, K., and Thomas, S., “Dynamic Mechanical Analysis of Microfibrillar Insitu Composites based on PP and PET”, in POLYCHAR 16 - World Forum for Advanced Materials, Lucknow, 2008.

2008

Conference Paper

Dr. Jayanarayanan K., Thomas, S., and Joseph, K., “Microfibrillar composites based on blends of Polypropylene and Poly (ethylene terephthalate): Morphology development, static and dynamic mechanical properties, crystallization behaviour and dynamic rheology”, in Second International Conference on Blends and Composites (ICBC-2008), Mahatma Gandhi University, Kottayam, 2008.

2007

Conference Paper

Dr. Jayanarayanan K., Joseph, K., and Thomas, S., “Mechanical and Thermal Properties of Microfibrillar Polymer Polymer Composite”, in International Seminar on Frontiers in Polymer Science and Technology, POLY-2007, Tezpur University, Assam, 2007.

2007

Conference Paper

Dr. Jayanarayanan K., Sivadayanithy, M., and Bhagawan, S. S., “Modelling techniques for optimizing polymer formulations and process parameters”, in International Conference on Natural Polymers (ICNP 2007), Kottayam, 2007.

2006

Conference Paper

Dr. Jayanarayanan K., Bhagawan, S. S., Shivashankari, S., R. Karthikeyan, V., K. Narayanan, D., and Venkateshwar, P., “Analysis of flow characteristics of injection molded polyacetal component”, in MACRO 2006, NCL, Pune, 2006.

2005

Conference Paper

Dr. Jayanarayanan K., Thomas, S., and Joseph, K., “Preparation and Properties of Microfibrillar based Polymer-Polymer Composites”, in International conference on Science and Technology for Sustainable Development, S B College, Changanacherry, 2005.

2005

Conference Paper

R. Vibanchya, Suganya, P., Satheeshkumar, P., Padmakumar, M. S., and Dr. Jayanarayanan K., “Analysis of Rejection Rate in Gas Assisted Injection Molded Products using FMEA”, in Third National conference on Polymers MACRO 05, Sri Jayachamarajendra College of Engineering, Mysore, 2005.

2004

Conference Paper

Dr. Jayanarayanan K., Ray, V. V., and Krishnaparasad, R., “Recycling of Scrap Tyres and Tyre Derived Fuel”, in National Seminar on “Emerging Trends in Polymer Engineering, STAS Mahatma Gandhi University,Kottayam, 2004.

2004

Conference Paper

Dr. Jayanarayanan K., “Role of Rheology In Polymer Extrusion”, in National Conference on Application of Melt Rheology in Polymer, AICTE-ISTE STTP, Amrita Institute of Technology, , 2004.

2003

Conference Paper

Dr. Jayanarayanan K., S. Selvan, A., and Kumar, P. V. Rajesh, “Process Optimisation of Injection Moulded Plastic Products Using Moldflow Analysis”, in EPAT 2003, National Symposium on Engineering Polymers: Applications and Technology, AITEC, Coimbatore, 2003.

Courses

CODE SUBJECT
CHE 211 Fluid Mechanics
CHE 241 Materials Science and Strength of Materials
MNG400 Principles of Management
CHE 291 Fluid Mechanics Laboratory
CHE 292 Strength of Materials Laboratory
207
PROGRAMS
OFFERED
5
AMRITA
CAMPUSES
15
CONSTITUENT
SCHOOLS
A
GRADE BY
NAAC, MHRD
8th
RANK(INDIA):
NIRF 2018
150+
INTERNATIONAL
PARTNERS