Qualification: 
M.Tech
n_rasana@cb.amrita.edu

Rasana currently serves as Assistant Professor at the Department of Chemical Engineering and Material Sciences, Amrita School of Engineering, Coimbatore. She obtained her Bachelor’s degree in Chemical Engineering from Govt. Engineering College, Calicut University in the year 2006. She received her Master’s degree in Chemical Engineering from Amrita Vishwa Vidyapeetham, Coimbatore campus. Currently she is pursuing her PhD at Amrita Vishwa Vidyapeetham, Coimbatore in “Multiscale Hybrid Thermoplastic Composites” under the guidance of Dr. K. Jayanarayanan. She has 10 years of experience in teaching. Her research interest includes Polymer Processing, Characterization of Composites, Development of Nano and Hybrid Polymer Composites, Thermomechanical Property Modeling of Composites.

Honors/ Awards/ Societies/ Recognitions

  • B. Tech. degree in Chemical Engineering conferred with Distinction and honors, from Calicut University in the year 2006. 
  • Best Paper Award: Won the best paper award for the paper entitled “Influence of multiphase fillers on the mechanical, transport and rheological properties of Polypropylene,” International Conference on Material Sciences (SCICON’16), Dec 2016 (Scopus), Organized by The Department of Sciences, Amrita School of Engineering, Amrita Vishwa Vidypeetham, Coimbatore
  • Board of Studies Member (Chemical Engineering, Amrita Vishwa Vidyapeetham)
  • ISAMPE - Life Member
  • Indian Institute of Chemical Engineers - Life Member

Publications

Publication Type: Journal Article

Year of Publication Publication Type Title

2019

Journal Article

N. Rasana, Dr. Jayanarayanan K., Deeraj, B. D. S., and K. Joseph, “The thermal degradation and dynamic mechanical properties modeling of MWCNT/glass fiber multiscale filler reinforced polypropylene composites”, Composites Science and Technology, vol. 169, pp. 249 - 259, 2019.[Abstract]


The present work is focused to explore the influence of multiscale fillers (nano scale multiwalled carbon nanotubes (MWCNTs) and micro scale Glass fibers) on the thermal degradation and dynamic mechanical properties of polypropylene (P). MWCNTs weight fraction was varied up to 5 wt% for a fixed glass fiber fraction of 20 wt% and the resultant composite was characterized using X-ray diffraction, Scanning and Transmission Electron Microscopy. Hybrid composites with 2 wt% MWCNTs presented 101% increase in the activation energy for thermal degradation compared to the base matrix. The synergism of multiscale fillers could be clearly verified by the improved storage and loss modulus of the composite with 3 wt% MWCNT which is related to better interfacial interaction of fillers with the matrix. The lowering of tan δ peak suggested the rise in entanglement density of polymer chains on the fillers and decrease in the damping behavior of the composites was observed till 3 wt% of MWCNTs both by experimental and theoretical model values. Beyond 3 wt% of MWCNTs agglomeration effects caused decline in the dynamic mechanical properties.

More »»

2018

Journal Article

N. Rasana, Dr. Jayanarayanan K., and Pegoretti, A., “Non-isothermal crystallization kinetics of polypropylene/short glass fibre/multiwalled carbon nanotube composites”, RSC Adv., vol. 8, pp. 39127-39139, 2018.[Abstract]


The non-isothermal crystallization kinetics of polypropylene (PP) reinforced with multiwalled carbon nanotubes (MWCNTs) and short glass fibres (GF) was studied by differential scanning calorimetry (DSC). The glass fibre concentration was maintained at 20 wt% and the MWCNT content ranged from 1 to 5 wt% in the PP matrix. The crystallization studies performed by DSC showed an increase in crystallization rate and a decrease in half time of crystallization of PP in the presence of micro and nano fillers. The Avrami{,} Ozawa{,} and Mo models were applied to analyze the non-isothermal crystallization behavior of PP multiscale composites. The Avrami model could very well describe the crystallization behavior of PP to 70% of the completion of crystallization. Beyond that level{,} it deviated significantly for all composites. On the other hand{,} the kinetics of crystallization could be well described by the Mo model. The strongest nucleating effect and the lowest activation energy were obtained for the composite with 2 wt% MWCNT and 20 wt% glass fibre. The X-ray diffraction analysis showed a significant reduction in the average crystal size in accordance with the amount of MWCNTs added.

More »»

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

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

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 »»

2017

Journal Article

S. Anjali, Aishwaryalakshmi, S., Ashwin, V., Neeraja, S., Rasana, N., and Dr. Jayanarayanan K., “Effect of compatibilizer and carbon nanotubes on blends of Polypropylene and Nylon 6”, Materials Today Proceedings (Scopus) , vol. 5, no. 11, Part 3, pp. 25524-25533, 2017.[Abstract]


The melt mixing of Polypropylene (PP) and Polyamide-6 (Nylon 6) results in a thermodynamically immiscible two phase system due to their high interfacial tension and poor adhesion. A compatibilizer namely Polypropylene grafted maleic anhydride (PP-g-MAH) is employed which encourages the formation of chemical linkages during reactive extrusion. In this study, PP/Nylon 6 blend ratio was maintained at 70/30. In addition to the compatibilizer, carboxylic acid functionalized multi walled carbon nanotubes (MWCNT) were added to the blend. The polymer blend prepared by twin screw extrusion was converted into test samples by injection moulding. The microstructure development of the blends was characterized by scanning electron microscopy (SEM) and fourier transform infrared spectroscopy (FTIR) techniques. The mechanical and thermal properties of the blends were studied using tensile test and differential scanning calorimetry (DSC) respectively. The effective dispersion of nylon phase due to the presence of MWCNTs and PP-g-MAH was established by SEM analysis. FTIR spectra revealed the efficacy of the compatibilizer in producing cyclic imide groups in the blends. The simultaneous addition of compatibilizer and MWCNTs improved the tensile strength, elongation at break, modulus of elasticity and hardness of the PP/Nylon 6 blend. Both compatibilizer and MWCNTs act as nucleating agents for the crystallization of PP. The crystallization temperature of PP was shifted to higher temperatures in the presence of both compatibilizer and MWCNTs as observed from DSC analysis. The blend which contained 6% PP-g-MAH and 2% MWCNT exhibited optimum set of properties

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 »»

Publication Type: Conference Paper

Year of Publication Publication Type Title

2017

Conference Paper

N. Rasana, “Effect of compatibilizer and carbon nanotubes on blends of Polypropylene and Nylon 6”, in International Conference on Advances in Materials and Manufacturing Applications, IconAMMA2017 (Scopus), Department of Mechanical Engineering, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Bangalore , 2017.

2016

Conference Paper

N. Rasana, “Influence of multiphase fillers on the mechanical, transport and rheological properties of Polypropylene”, in International Conference on Material Sciences SCICON’16, (Scopus) , Department of Sciences, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Coimbatore , 2016.

2014

Conference Paper

N. Rasana, Rangarajan, M., and Dr. Udaya Bhaskar Reddy Ragula, “Design and Implementation of Model Predictive Control in a Three Tank Interacting System”, in International Conference on Recent Advances in Chemical, Environmental and Energy Engineering (RACEEE2014), S.S.N College of Engineering, Chennai, 2014.[Abstract]


An advanced control method, Model Predictive Control (MPC) has been widely used and well received in a wide variety of applications in process control. MPC utilizes an explicit process model to predict the future response of a process and solve a control problem with a finite horizon at each sampling instant. Model predictive control has proven to be a very effective controller design strategy over the last twenty years and has been widely used in process industry, such as oil refining, chemical engineering and metallurgy. A greater challenge for the controllers is to control an unstable system. In this work, a three tank interacting system has been used to implement Model Predictive Control for controlling the level of water in all the three tanks placed at the corners of an equilateral triangle with input, interaction and drain from each tank thus making the system a Multi-Input Multi-Output (MIMO). The appropriate model equations in the non-linear form have been formulated for the proposed system. The non-linear equations are linearized and a state space model was developed and implemented using MPC tool box of MATLAB. MPC simulation environment has been used to design the controller for the three tank interacting system and compared 
the results under various operating conditions including the constraints. The MPC behavior has been analyzed for set point control of the level of water in three tanks by tuning the extent of interaction between the tanks through the openings of solenoid valves connecting the tanks.</p>

More »»

Publication Type: Book Chapter

Year of Publication 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 »»

Teachings

Energy Balance and Thermodynamics Heat Transfer in Chemical Engineering/ Process Heat Transfer Chemical Engineering Thermodynamics
Material Balances/ Introduction to Chemical Engineering Numerical Methods in Chemical Engineering Chemical Reaction Engineering
Process Dynamics and Control Process Instrumentation and Control Introduction to Thermodynamics
Polymer Materials-Structure property relations Organic Chemical Technology Engineering Management
Transport Phenomena Environmental Studies Computer Programming
Fluid Mechanics Laboratory Process Dynamics and Control Laboratory Mass Transfer Operations Laboratory
Heat Transfer Laboratory Chemical Reaction Engineering Laboratory Chemical Process Simulation lab using Matlab
Computer Aided Drawing/ CADIAN Engineering Drawing