Abstract
A model is proposed for segmental relaxation that requires intermolecular cooperativity. A domain of cooperativity is defined as a group of segments that must undergo relaxation simultaneously. A relaxation function is formulated based on the domain size distribution. The resulting equation gives a better fit to the dielectric and viscoelastic data than the Kohlrausch-Williams-Watts equation. The theory is extended into the nonequilibrium glassy state by fixing the entropy at the fictive temperature
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