Phase separation of polymer solutions in elongational flow

Bhattacharjee, Somendra M. ; Fredrickson, Glenn H. ; Helfand, Eugene (1989) Phase separation of polymer solutions in elongational flow Journal of Chemical Physics, 90 (6). pp. 3305-3317. ISSN 1674-0068

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Official URL: http://jcp.aip.org/resource/1/jcpsa6/v90/i6/p3305_...

Related URL: http://dx.doi.org/10.1063/1.455885

Abstract

We have studied the phase separation behavior of polymer solutions in two-dimensional elongational flows that are sufficiently weak to avoid the coil-stretch transition. On the basis of a simple model that neglects hydrodynamic interactions, we find no shifts in the infinite molecular weight θ point, or coexistence curve. For finite chain lengths, there are flow-induced shifts of both quantities. These shifts are calculated to leading order in a loop expansion and are found to be order (Sζ)2N7/2, where S is the extension rate, ζ is the monomer friction coefficient, and N is the degree of polymerization. Our results are in qualitative agreement with experimental observations that find demixing promoted by flow.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
ID Code:3091
Deposited On:09 Oct 2010 10:03
Last Modified:19 May 2011 10:43

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