Entropy, landscapes, and fragility in liquids and polymers, and the ΔCp problem

Research output: Contribution to journalConference article

Abstract

We examine the relation of the mode coupling theory of glassforming liquid dynamics to the Gibbs-Goldstein landscape picture of relaxation, and identify, using both scaling relationships and thermodynamic calculations, where the crossover between the two domains occurs. This "landscape" approach is then applied to chain polymers, using a neglected relation between the WLF C1 parameter and the high frequency limit for relaxation, to establish the characteristic temperature of the landscape ground state and the appropriate fragility parameters. A problem with the relation between thermodynamic to relaxational assessments of the landscape "height" is used to focus attention on a problem with the heat capacity changes at Tg in the case of chain polymer melts and their glasses.

Original languageEnglish (US)
Pages (from-to)37-52
Number of pages16
JournalACS Symposium Series
Issue number710
StatePublished - Dec 1 2001
Event213th National Meeting of the American Chemical Society - San Francisco, CA, United States
Duration: Apr 13 1997Apr 17 1997

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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