Dynamic fragility in polymers: A comparison in isobaric and isochoric conditions

Dinghai Huang, Dina M. Colucci, Gregory B. McKenna

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The dynamic fragilities of six polymeric materials were compared for isobaric and isochoric conditions. The pressure-volume-temperature (PVT) data were used to determine the dynamic response as a function of temperature for both the isochoric and isobaric conditions. It was found that the pressure and volume dependence of the dynamic fragility vary greatly among the polymers. It was found that for poly(vinyl acetate) (PVAc) and poly(ethyl acrylate) (PEA), the dynamic fragility index m was insensitive to the pressure and volume, and for poly(vinylchloride) (PVC) and poly(ethyl acrylate) (PEA) and polystyrene (PS) the value of m depended on pressure in isobaric experiments, and on volume in the isochoric experiments.

Original languageEnglish
Pages (from-to)3925-3934
Number of pages10
JournalJournal of Chemical Physics
Issue number9
StatePublished - Mar 1 2002


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