Thermally stimulated modulus relaxation in polymers: Method and interpretation

Hermann Wagner, Ranko Richert

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

We have measured the thermally stimulated decay of the dielectric modulus M(T, t) for poly(vinylacetate) by monitoring the electric field E(t) under the condition of a constant dielectric displacement for t > O. This thermally stimulated polarization experiment is realized by cooling the sample at zero field to well below its glass transition temperature, applying a certain amount of charge, and then recording the voltage of the sample capacitor U(T, t) while ramping the temperature. The result of a temperature invariant distribution of relaxation times observed previously in isothermal experiments allows a direct translation of M(T, t) data into the variation of a characteristic relaxation time τ(T) or of a fictive temperature Tf(T) as a function of the actual temperature.

Original languageEnglish (US)
Pages (from-to)5801-5806
Number of pages6
JournalPolymer
Volume38
Issue number23
DOIs
StatePublished - Nov 1997
Externally publishedYes

Keywords

  • Dielectric relaxation and retardation
  • Glass transition
  • Thermally stimulated discharge

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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