Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 357, Issue 2, Pages 414-418Publisher
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2010.07.055
Keywords
Glass transition; Relaxation time; PVT behaviour; Amorphous polymers
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The scaling law for relaxation times, recently proposed by Casalini and Roland, is utilized in the framework of KAHR (Kovacs, Aklonis, Hutchinson, and Ramos) phenomenological theory. With this approach it is shown that the pressure, volume, and temperature (PVT) data obtained on Poly(methyl-methacrylate) (PMMA) can be reliably predicted, in the region of the alpha-relaxation, by using only two fitting parameters, namely: the relaxation time in the reference state, T-g, and the fractional exponent, 13, that describes the dispersion of the alpha-relaxation. (C) 2010 Elsevier B.V. All rights reserved.
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