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Adam-Gibbs Formulation of Nonlinear Enthalpy Relaxation

Published online by Cambridge University Press:  16 February 2011

Ian M. Hodge
Ian M. Hodge*
Affiliation:
Photographic Research Laboratories, Eastman Kodak Company, Rochester, New York 14650-2116
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Abstract

The Adam-Gibbs (AG) expression linking relaxation times with configurational entropy gives an excellent account of the nonlinearity observed in enthalpy relaxation of amorphous polymeric, inorganic, and simple molecular materials near and below Tg. Data analyses yield zero entropy temperatures that are comparable with available Kauzmann values. The AG formulation, when coupled with a few plausible ancillary assumptions, predicts correlations between the Arrhenius parameters x, Δh*, and the KWW exponent β that are observed experimentally. It is suggested that the AG primary activation energy, Δμ, is the single causative factor that generates these correlations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 215: Symposium R2 – Structure, Relaxation and Physical Aging of Glassy Polymers , 1990 , 11
Copyright
Copyright © Materials Research Society 1991

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