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Theory of volume transitions in polyelectrolytegels

Published online by Cambridge University Press:  10 May 2012

Mithun K. Mitra  and
M. Muthukumar
Mithun K. Mitra
Affiliation:
Polymer Science and Engineering, University of Massachusetts Amherst, MA 01003, U.S.A.
M. Muthukumar
Affiliation:
Polymer Science and Engineering, University of Massachusetts Amherst, MA 01003, U.S.A.
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Abstract

We present the key assumptions and results of a newly developed theory inorder to account for the self-consistent cascade effects of counterioncondensation and volume collapse of polyeletrolyte gels. In the presenttheory, the role of the specificity and valency of counterions on the volumetransitions are also treated. These features and the fluctuations of monomerconcentration and local electrolyte charge density are included on top ofthe familiar features of the Flory-Huggins theory and the classical rubberelasticity theory in the previously used Flory-Dusek-Patterson-Tanaka theoryof polyelectrolyte gels. We have computed the swelling equilibria bysatisfying the multicomponent nature of the system and the Donnanequilibria. A few major effects are illustrated in terms of the dependenceof volume transition on the solvent quality, temperature, saltconcentration, valency and specificity of the counterion, and polymer chargedensity. Criteria for the emergence of a reentrant volume transition arealso derived.

Keywords

sol-gelpolymerelastic properties

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Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1418: Symposium LL/MM – Gels and Biomedical Materials , 2012 , mrsf11-1418-ll07-02
Copyright
Copyright © Materials Research Society 2012

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