Enthalpy relaxation in glassy polystyrenes: 1

A. Brunacci, J. M G Cowie, R. Ferguson, I. J. McEwen

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

Enthalpy relaxation at temperatures below the glass transition has been measured for three substituted polystyrene samples and for one poly(a-methylstyrene) sample. The overall changes in enthalpy between the experimental glass and the fully relaxed glass (?H8) were estimated by fitting experimental data to the three-parameter Cowie-Ferguson expression. These were compared with enthalpy relaxation in polystyrene itself. There was no experimentally detectable effect from the para substituent on the progress of enthalpy loss in the samples. Poly(4-hydroxystyrene), however, was found to exhibit unexpectedly high values of ?H8. The utility of the Cowie-Ferguson approach with respect to multiparameter phenomenological kinetic expressions for enthalpy relaxation is discussed. © 1997 Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)865-870
Number of pages6
JournalPolymer
Volume38
Issue number4
Publication statusPublished - 1997

Keywords

  • Enthalpy relaxation
  • Physical ageing
  • Styrene polymers

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