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Published November 1, 2011 | Published + Supplemental Material
Journal Article Open

Thermodynamics of Ion-Containing Polymer Blends and Block Copolymers

Abstract

We develop a theory for the thermodynamics of ion-containing polymer blends and diblock copolymers, taking polyethylene oxide (PEO), polystyrene and lithium salts as an example. We account for the tight binding of Li^+ ions to the PEO, the preferential solvation energy of anions in the PEO domain, the translational entropy of anions, and the ion-pair equilibrium between EO-complexed Li^+ and anion. Our theory is able to predict many features observed in experiments, particularly the systematic dependence in the effective χ parameter on the size of the anions. Furthermore, comparison with the observed linear dependence in the effective χ on salt concentration yields an upper limit for the binding constant of the ion pair.

Additional Information

© 2011 American Physical Society. Received 19 May 2011; published 1 November 2011. This research has been supported by the National Science Foundation, Grant No. CBET-0965812.

Attached Files

Published - Nakamura2011p16550Phys_Rev_Lett.pdf

Supplemental Material - R2_supplementary.pdf

Supplemental Material - R2_supplementary.tex

Supplemental Material - README.TXT

Supplemental Material - figure_sup.eps

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