Flow-induced phase separation in polymer solutions

Author: de Moel K.   Flikkema E.   Szleifer I.   G. ten Brinke K.  

Publisher: Edp Sciences

E-ISSN: 1286-4854|42|4|407-412

ISSN: 0295-5075

Source: EPL (EUROPHYSICS LETTERS), Vol.42, Iss.4, 2010-03, pp. : 407-412

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Abstract

A correct description of phase behaviour in polymer solutionsrequires a coupling between configurational statistics andthermodynamics. The effect of flow-induced chain deformation on the polymer-solvent interaction energy depends on the concentrationand on the polymer architecture. It will be demonstrated, using thermodynamic arguments, that for linearpolymers this may give rise to a large flow-induced demixing. For more complex architectures such as ring polymers and branchedpolymers, a maximum in the critical temperature vs. flow rate ispredicted.