Abstract
AbstractLarge stress peaks have been observed by subjecting a weakly crosslinked polyisoprene vulcanizate to double‐step extensions in opposite directions. The resulting retractions are well described by a BKZ constitutive equation with a strain‐dependent term identical to that for deviations from the statistical elasticity theory at equilibrium. This unexpected nonlinear behavior suggests that disengagement of pendant chains and attenuation of junction constraints both contribute to the stress relaxation of random networks.
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