Simulation of linear and nonlinear viscoelasticity for the polymer solution by the primitive chain network model

摘要

Simulations by the primitive chain network (PCN) model, which is one of the sliplink simulations, are compared with the rheological data of the monodisperse linear polystyrene solution. The model includes the repetition, contour length fluctuations, force balance around entanglements, convective constraint release, etc. The adjustable shift factors for the model are the plateau modulus G{sub}0(∞) and the relaxation time τ{sub}e of the subchains between consecutive entanglements. The PCN model provides good predictions with the same shift factors (G{sub}0(∞) and τe) in both the linear viscoelasticity and the nonlinear behavior, e.g., the relaxation modulus, and the stress overshoot in start up of steady shear flow. It means that the PCN model successfully describes the dominant mechanism for the nonlinear viscoelasticity.