Reduction of Dielectric Signal of the Interfacial Segmental Dynamics in Polymer Nanocomposites

POSTER

Abstract

In this study we focus on polymer nanocomposites (PNCs) with dispersed silica core nanoparticles. We examine the dielectric strength and relaxation behavior of segmental dynamics in the interfacial polymer layer surrounding silica nanoparticles. The presented analysis reveals the significant drop in the dielectric strength, and its anomalous temperature dependence in polymer layer adsorbed to nanoparticles. We ascribe the observed effect to the restricted amplitude of segmental relaxation in the interfacial/adsorbed layer. The theoretical model explaining the unusual temperature dependence of dielectric strength is presented. Our results provide new view on discussion of dynamics in interfacial layer in PNC that may be applied to the thin polymer films as well: Not only characteristic time scale, but also amplitude of structural relaxation can be strongly affected by the presence of an interface.

*Work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.

Presenters

  • Ivan Popov

    • Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
    • Oak Ridge National Lab

Authors

  • Ivan Popov

    • Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
    • Oak Ridge National Lab

  • Bobby Carroll

    • Department of Physics, University of Tennessee, Knoxville, Tennessee 37996, USA

  • Vera bocharova

    • Oak Ridge National Lab
    • Oak Ridge National Laboratory, Oak Ridge, TN 37831
    • Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
    • Oak Ridge National Laboratory

  • Anne-Caroline Genix

    • Laboratoire Charles Coulomb, Université de Montpellier, CNRS, F-34095, France
    • Université de Montpellier

  • Shiwang Cheng

    • Department of Chemical Engineering and Materials Science, Michigan State University, East Lancing, Michigan 48824, USA

  • Airat Khamzin

    • Kazan Federal University, Institute of Physics, 420008, Kremlevskaya str.18, Kazan, Tatarstan, Russia

  • Alexander Kisliuk

    • Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

  • Alexei Sokolov

    • Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
    • University of Tennessee, Knoxville