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Strong and Fragile Behavior in Liquid Polymers

Published online by Cambridge University Press:  16 February 2011

C. A. Angell,
L. Monnerie and
L. M. Torell
C. A. Angell
Affiliation:
Arizona State University, Dept. of Chemistry, Tempe, AZ 85287-1604
L. Monnerie
Affiliation:
Laboratoire de physico-chimie, Structurale et Macromoleculaire, E.S.P.C.I., 10 Rue Vauquelin, 75005 Paris, France
L. M. Torell
Affiliation:
Department of Physics, Chalmers University of Technology, Goteborg, S-41296, Sweden
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Abstract

In the light of the strong and fragile classification of simple liquids we review some of the relaxation data for some well-known polymers to see the extent to which a similar pattern may be manifested. Relaxation time data rather than viscosity data are used in the polymer case to avoid complications from long chain effects on the Vogel-Fulcher equation pre exponent. A combination of light scattering and 13C NMR data seem to provide the most reliable guide to the microviscosity of interest to the classification. A pattern similar to that for viscous liquids is recovered with polyisobutylene, the “strongest” chain polymer and bisphenol polycarbonate, the most fragile. The extent to which correlations of other properties with fragility, found in the non-polymeric liquids cases, will carry over to the polymer case is still being evaluated, though the work of Hodge on the analysis of the more complicated problem of non-linear thermal relaxation, suggests the carry over may be extensive.

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