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Dielectric properties study of surface engineered nano TiO2/epoxy composites

Publication Type : Journal Article

Publisher : Bulletin of Materials Science

Source : Bulletin of Materials Science, 41(1), 1-9.

Url :

Campus : Bengaluru

School : School of Engineering

Center : Amrita Innovation & Research

Department : Chemistry

Verified : Yes

Year : 2018

Abstract : Nanodielectrics are promising materials that can efficiently store a large amount of electrical energy that are desirable for many electronic and power devices. Control of polymer–particle interface in nanodielectrics is very critical in not only obtaining the improved quality of dispersion but also in altering the dielectric properties. Various surface modifying agents with linear (alkyl), aromatic (phenyl) and extended aromatic (naphthyl) chemical nature were employed at the epoxy–nano\(\hbox {TiO}_{2}\) interface. All the surface-modifying agents were successful in passivating the nanoparticles surface and in obtaining the improved quality of polymer–particle dispersion and improved glass transition temperature comparatively. However, all the surface modifiers were not successful in obtaining the improved dielectric properties of the nanodielectrics, especially dielectric breakdown resistance. Only the extended aromatic group at the polymer–particle interface, which is more electron withdrawing in electronic nature than phenyl and alkyl structures, was successful in improving the dielectric breakdown resistance. Thus, the choice of surface-modifying agent based on its chemical and electronic nature is very important in optimizing the dielectric properties of nanodielectrics. Naphthyl phosphate-modified nano\(\hbox {TiO}_{2}\)–epoxy composite films of \(\sim \)90–100 \(\upmu \)m thick at 5 vol% particle concentration yielded higher dielectric breakdown resistance than pure epoxy polymer and thereby resulted in about 90% higher electrical energy storage density than the pure epoxy film.

Cite this Research Publication : Siddabattuni, Sasidhar & Akella, Sri Harsha & Abilash, Gangula & Belliraj, Sivakumar & Chunduri, Avinash. (2018). Dielectric properties study of surface engineered nanoTiO2/epoxy composites. Bulletin of Materials Science. 41. 10.1007/s12034-017-1526-6.

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