Stress Relaxation of Entangled Polymer Networks

Details Stress Relaxation of Entangled Polymer Networks Stress Relaxation of Entangled Polymer Networks

1999-10-11

arxiv.org/abs/cond-mat/9910160v1

Physics

Condensed Matter

Soft Condensed Matter

9 pages, 3 figures, RevTeX

Scientific paper

10.1016/S0022-3093(00)00224-6

The non-linear stress-strain relation for crosslinked polymer networks is studied using molecular dynamics simulations. Previously we demonstrated the importance of trapped entanglements in determining the elastic and relaxational properties of networks. Here we present new results for the stress versus strain for both dry and swollen networks. Models which limit the fluctuations of the network strands like the tube model are shown to describe the stress for both elongation and compression. For swollen networks, the total modulus is found to decrease like (V_0/V)^{2/3} and goes to the phantom model result only for short strand networks.

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