Dielectric loss of poly(vinylacetate) at electric fields of 400 kV/cm

Ullas Pathak, Ranko Richert

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Using quasi-steady-state and time-resolved high-field impedance techniques, the frequency-dependent dielectric permittivity of poly(vinylacetate) has been studied at electric field amplitudes as high as 400 kV/cm. The relative changes of the dielectric loss depend quadratically on the field amplitude and reach about 1 %. The magnitude and frequency-dependence of this non-linear dielectric effect and its time evolution after applying the high field are consistent with energy absorption from the field being at the source of the non-linear behavior. Based upon a phenomenological model of heterogeneous dynamics at isothermal conditions, the observed changes can be explained by locally increased configurational temperatures and the resulting accelerated dynamics.

Original languageEnglish (US)
Pages (from-to)1905-1911
Number of pages7
JournalColloid and Polymer Science
Volume292
Issue number8
DOIs
StatePublished - Aug 2014

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Keywords

  • Dielectric relaxation
  • Dynamic heterogeneity
  • Glass-forming polymers
  • Non-linear dynamics

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry

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