Flow-induced phase separation in polymer solutions
Department of Polymer Chemistry and the Material Science Centre
University of Groningen - Nijenborgh 4, 9747 AG Groningen, The Netherlands
2 Department of Chemistry, Purdue University - West Lafayette, IN 47907, USA
Accepted: 25 March 1998
A correct description of phase behaviour in polymer solutions requires a coupling between configurational statistics and thermodynamics. The effect of flow-induced chain deformation on the polymer-solvent interaction energy depends on the concentration and on the polymer architecture. It will be demonstrated, using thermodynamic arguments, that for linear polymers this may give rise to a large flow-induced demixing. For more complex architectures such as ring polymers and branched polymers, a maximum in the critical temperature vs. flow rate is predicted.
PACS: 36.20.Ey – Conformation (statistics and dynamics) / 64.70.Ja – Liquid-liquid transitions / 83.50.Jf – Extensional and combined flows
© EDP Sciences, 1998