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Viscoelastic Relaxation in Glassy Polymers

Published online by Cambridge University Press:  26 February 2011

T. S. Chow
T. S. Chow*
Affiliation:
Xerox Corporation, Webster Research Center, Webster, N.Y. 14580
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Abstract

The nonequilibrium mechanism controlling the viscoelastic response in the glassy state is analyzed in accordance with our multiple hole energy model. The change in the nonequilibrium glassy state defines the Struik physical aging exponent and determines the motion of the relaxation time spectrum, the transition of the global shift factor and the slow decay of the stress relaxation modulus especially at longer times in the glassy state where the Kohlrausch-Williams-Watts function fails. Although the distribution of relaxation times has its time scales shifted with the aging time, the shape of the spectrum remains very much the same which supports the notion of thermo-aging-rheological simplicity in the glassy and transition states.

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