TITLE

Localized relaxation’s strength and its mimicry of glass-softening thermodynamics

AUTHOR(S)
Johari, G. P.; Power, G.; Vij, J. K.
PUB. DATE
April 2002
SOURCE
Journal of Chemical Physics;4/1/2002, Vol. 116 Issue 13, p5908
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The dielectric relaxation strength of the β process, Δ&Vegr;[sub β], in a rigid-molecular glass of 16.6 mol % chlorobenzene cis-decalin mixture increases slowly with temperature, T, until the glass-softening range is reached, and thereafter it increases rapidly, i.e., (dΔ&Vegr;[sub β]/dT) increases at T[sub g] relatively abruptly. This is remarkably similar to the volume and entropy against T plots of a glass being heated through its T[sub g] and of the implied rise in the expansion coefficient and heat capacity near T[sub g]. The β-relaxation rate increases smoothly through T[sub g] according to the Arrhenius equation, and the distribution of relaxation times becomes narrower. Both the entropy and free volume affect Δ&Vegr;[sub β], but not the rate. © 2002 American Institute of Physics.
ACCESSION #
6365830

 

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