Abstract
A new theoretical relationship between the rubberlike elasticity of a polymer network and the distribution of the vector connecting junction points (or the end-to-end vector distribution function of the chain joining two of these points) is presented. In this approach the free energy of the chains is correctly averaged over the network structure, a difference with respect to older treatments in which a preaveraged deformation dependence is considered. The new theory and a slight modification in the previous procedure to analyze bimodal network data lead to a more satisfactory explanation of these data (presenting a pronounced upturn for high extensibilities due to non-Gaussian effects) in terms of molecular magnitudes. © 1986, American Chemical Society. All rights reserved.
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