Dielectric relaxation of the electric field in poly(vinyl acetate): A time domain study in the range 10-3-106 s

Hermann Wagner, Ranko Richert

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

Abstract

We have measured the polarization of poly(vinyl acetate) in terms of a real dielectric relaxation technique by studying the decay of the electric field E(t) for times 10-3 s ≤ t ≤ 106 s under the condition of a constant dielectric displacement for t > 0. This represents a direct measurements of the dielectric modulus M(t), opposed to the conventional method of measuring the dielectric retardation ε(f), or its frequency domain analogue ε*(ω). The advantages of accessing M(t) are a simple experimental set-up and for polar materials experimental times which are shorter by at least a factor of εs relative to ε(t) decays. The latter effect is based on the well-known relation τL = εsτD between transversal and longitudinal dielectric time constants. For the polymer under study, we find that no significant change of the relaxation time distribution occurs within the experimental time window, i.e. from well above the glass transition at Tg (if defined via τg = τ(Tg) = 100 s) to temperatures below Tg where the average retardation times (τ) attain values of up to 107 s.

Original languageEnglish (US)
Pages (from-to)255-261
Number of pages7
JournalPolymer
Volume38
Issue number2
DOIs
StatePublished - Jan 1 1997
Externally publishedYes

Keywords

  • Dielectric relaxation and retardation
  • Glass transition
  • Relaxation time distribution

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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