In-situ and ex-situ TiO2-based dielectric polymer nanocomposites

P. Khodaparast, Zoubeida Ounaies

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

One of the main challenges in understanding the dielectric behavior of nanocomposites is achieving true nanoscale dispersion. In this paper, we introduce in-situ sol-gel synthesis of nanoparticles in the polymer solution as an effective way to overcome dispersion challenges. We compare nanocomposites prepared using commercially available nanoparticles to those prepared using in-situ and ex-situ synthesis of nanoparticles in our laboratory. As-received TiO2 particles increased the dielectric permittivity of PVDF by 10% at 1kHz but showed strong aggregation and poor dispersion in PVDF. However, in-situ TiO2/PVDF showed uniform individual dispersion and 96% increase in dielectric permittivity. Nevertheless, the in-situ composite suffered from high dielectric loss, which is likely due to chemical residues left over from the sol-gel process. In order to address this high dielectric loss, TiO2 particles were synthesized in an ex-situ technique, rinsed and dried to remove the impurities and finally ultrasonicated using a high power probe sonication for 1.5 hr. The ex-situ sample showed 48% increase in dielectric permittivity and reasonably low dielectric loss. There was still some extent of aggregation in the ex-situ sample, which will be addressed using ultra fast centrifugation techniques. The results of our study shed some light on the role of dispersion quality and processing techniques in affecting the final dielectric behavior of TiO2-based polymer nanocomposites.

Original languageEnglish (US)
Title of host publication28th Annual Technical Conference of the American Society for Composites 2013, ASC 2013
Pages992-999
Number of pages8
StatePublished - Dec 1 2013
Event28th Annual Technical Conference of the American Society for Composites 2013, ASC 2013 - State College, PA, United States
Duration: Sep 9 2013Sep 11 2013

Publication series

Name28th Annual Technical Conference of the American Society for Composites 2013, ASC 2013
Volume2

Other

Other28th Annual Technical Conference of the American Society for Composites 2013, ASC 2013
CountryUnited States
CityState College, PA
Period9/9/139/11/13

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites

Fingerprint Dive into the research topics of 'In-situ and ex-situ TiO<sub>2</sub>-based dielectric polymer nanocomposites'. Together they form a unique fingerprint.

  • Cite this

    Khodaparast, P., & Ounaies, Z. (2013). In-situ and ex-situ TiO2-based dielectric polymer nanocomposites. In 28th Annual Technical Conference of the American Society for Composites 2013, ASC 2013 (pp. 992-999). (28th Annual Technical Conference of the American Society for Composites 2013, ASC 2013; Vol. 2).