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Fluctuation-induced forces in critical crosslinked polymer blends
-
Saâd El Fassi
,
Abdellatif Agouzouk
Published/Copyright:
August 9, 2011
Abstract
In this paper, we report on the computation of the induced forces in crosslinked polymer blends, with immersed small colloidal particles (nanoparticles) or confined to two parallel plates (film). We assume that the particles or the walls prefer to be attracted by one polymer, close to the spinodal temperature where a microphase separation takes place. This is the so-called “critical adsorption”. As an assumption, the particle diameter or the film thickness is considered to be small enough in comparison with the size of microdomains (“mesh size”). The critical fluctuations of the crosslinked mixture induce a pair potential between particles located in the non-preferred phase or between the confining walls. The purpose is to recall how this Casimir pair potential can be determined, as a function of the interparticle distance or the walls separation. To achieve calculations, use is made of an extended de Gennes model that takes into account the colloid-polymer and polymer-wall interactions. Finally, the obtained results are compared to those relatively to uncrosslinked polymer blends in the same geometries, and the main conclusion is that the induced force is reduced by the presence of permanent crosslinks.
Keywords: Casimir pair potential; colloidal particles; confining walls; critical fluctuations; crosslinked polymer blends
Published Online: 2011-08-09
Published Online: 2011-07-08
Published in Print: 2011-07-01
©2011 by Walter de Gruyter Berlin Boston
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Keywords for this article
Casimir pair potential;
colloidal particles;
confining walls;
critical fluctuations;
crosslinked polymer blends
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