Flow Induced Liquid-Liquid Phase Separation in High Molecular Weight Polymer Solutions
Rheological studies of very high molecular weight Poly(methylmethacrylate) (PMMA) solutions have revealed three distinct types of anomolous behaviour. These are interpreted as being due to: at low rates, the formation of topological adsorption — entanglement layers? at intermediate rates the nucleation by adsorption-entanglement layers of a flowinduced liquid-liquid phase separation, and at high rates a spontaneous liquid-liquid phase separation. An attempt has been made to construct the phase diagram for the binary system PMMA — dimethylphthlate using shear stress, as well as temperature and solution concentration as thermodynamic variables.
KeywordsPhase Diagram Final Rate Normal Stress Difference Thermodynamic Variable Intermediate Rate
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