| Numerical predictions of a previsouly proposed thermodynamically consistent reptation model for linear entangled polymers are presented for shear and extensional flows. Comparisons with experimental data and two alternative molecular-based models are given in detail. The model presented in this contribution incorporates the essence of double reptation, convective constraint release and chain stretching, and it avoids the independent alignment approximation. Simulation results reveal that the model at a highly simplified level with few structural variables, i.e., four degrees of freedom, is able to capture qualitatively all features of the available experimental observations and is highly competitive with recently proposed models in describing rheological properties of linear entangled polymers. |
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