| We consider a modification of the Doi-Edwards and Curtiss-Bird models for polymer melts in which the effect of constraint release or partially anisotropic Brownian motion is introduced through a stochastic force in the time-evolution equation for the orientation of inner chain segments. A thermodynamically consistent expression for the stress tensor is proposed. In the linear viscoelastic regime, the results for the moduli are very similar to those predicted by double reptation. In the nonlinear viscoelastic regime, the new model describes the rheological behavior in an objective manner. The shear-rate dependence of the viscosity obtained from the new reptation model is more realistic than the Doi-Edwards prediction.
for LaTeX users @article{HC\"Ottinger1994-50,
author = {H. C. \"Ottinger},
title = {Modified reptation model},
journal = {Phys. Rev. E},
volume = {50},
pages = {4891-4895},
year = {1994}
}
\bibitem{HC\"Ottinger1994-50} H.C. \"Ottinger,
Modified reptation model,
Phys. Rev. E {\bf 50} (1994) 4891-4895.HC\"Ottinger1994-50
H.C. \"Ottinger
Modified reptation model
Phys. Rev. E,50,1994,4891-4895 |
mk@mat.ethz.ch
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