Modeling shear-induced phase transitions of binary polymer mixtures

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Abstract

The shear-induced phase transitions of binary polymer mixts. have been studied. We solved the two-fluid model numerically in a high Weissenberg no. and infinite Peclet no. flow regime without linearization of the diffusive equation or the adiabatic approxn. Our simulations have captured key features of flow-induced phase transitions, such as the shift in the phase boundary from the equil. phase diagram under flow conditions. Both shear-induced mixing and demixing phenomena have been reproduced. The dynamic phase behavior of polymer mixts. is governed by parameters including ?????A and ????? for thermodn. forces, ?????' and G' for the degree of dynamical asymmetry in polymer mixts., and the imposed nominal shear rate. Dynamic phase diagrams are obtained for steady state flow. We have identified correlations between the microstructure evolution and rheol., and a mechanism to reach the steady state. The rheol. signature of demixing fluids under shear is that the dependence of the steady state shear stress on shear rate changes from nonlinear to linear within that range of shear rates in which the demixing occurs. [on SciFinder(R)]

Keyword(s)

Phase transition; Polymer blends Role: PRP (Properties) (modeling shear-induced phase transitions of binary polymer mixts.) ; Shear stress; Simulation and Modeling (modeling shear-induced phase transitions of binary polymer mixts.) ; model shear induced phase transition binary polymer mixt

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