The effect of shear flow on phase separation in entangled polymer blends

Authors
Citation
N. Clarke, The effect of shear flow on phase separation in entangled polymer blends, FARADAY DIS, (112), 1999, pp. 249-265
Citations number
27
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
Faraday discussions
ISSN journal
1359-6640 → ACNP
Issue
112
Year of publication
1999
Pages
249 - 265
Database
ISI
SICI code
1359-6640(1999):112<249:TEOSFO>2.0.ZU;2-K
Abstract
We model the effects of shear flow on small concentration fluctuations in w ell entangled polymer blends subjected to steady state shear flow. We predi ct that shear can result in the growth (shear induced de-mixing) and the su ppression (shear induced mixing) of concentration fluctuations in the quies cent one phase region, in both the velocity gradient and vorticity directio ns. The controlling parameters are the relative relaxation times and the re lative plateau moduli of the two components. We show that increasing the sh ear rate, so that the effects of shear thinning become important, can resul t in the behaviour changing from shear induced mixing to shear induced de-m ixing and vice versa. Finally, we present quantitative predictions for the changes in the phase boundary that should occur in a high molecular weight polybutadiene/deuterated-polybutadiene blend subjected to shear.