Flow Induced Liquid-Liquid Phase Separation in High Molecular Weight Polymer Solutions

  • P. J. Barham


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.


Phase Diagram Final Rate Normal Stress Difference Thermodynamic Variable Intermediate Rate 
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Copyright information

© Elsevier Science Publishers Ltd 1990

Authors and Affiliations

  • P. J. Barham
    • 1
  1. 1.H.H. Wills Physics Lab.University of BristolBristolUK

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