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Anomalous stress relaxation in random macromolecular networks
ISSN
0378-4371
Date Issued
2001
Author(s)
DOI
10.1016/S0378-4371(01)00471-X
Abstract
Within the framework of a simple Rouse-type model we present exact analytical results for dynamical critical behaviour on the sol side of the gelation transition. The stress-relaxation function is shown to exhibit a stretched-exponential long-time decay. The divergence of the static shear viscosity is governed by the critical exponent k = phi - beta, where phi is the (first) crossover exponent of random resistor networks, and P is the critical exponent for the gel fraction. We also derive new results on the behaviour of normal stress coefficients. (C) 2001 Published by Elsevier Science B.V.