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Modeling the Chemo-mechanical Behavior of Reactive Polymer Gels

Published online by Cambridge University Press:  01 February 2011

Victor V. Yashin  and
Anna C. Balazs
Victor V. Yashin
Affiliation:
yashin@dorothy.che.pitt.edu, University of Pittsburgh, Chemical and Petroleum Engineering, 1249 Benedum Hall, Pittsburgh, PA, 15261, United States, (412) 624-4888, (412) 624-9639
Anna C. Balazs
Affiliation:
balazs1@engr.pitt.edu, University of Pittsburgh, Department of Chemical and Petroleum Engineering
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Abstract

We consider a theoretical model of a reactive polymer gel in which the reaction can proceed in an oscillatory regime and generate traveling chemical waves accompanied by waves of local swelling-deswelling. This type of gel could be used for fabricating chemo-mechanical devices with self-sustained rhythmic action, and gel-based pumps. We assume that the Belousov-Zhabotinsky (BZ) reaction takes place in the reactive gel. The BZ reaction generates periodic reduction-oxidation (redox) changes of a metal catalyst covalently bonded to a hydrogel that is immersed in a solution containing the rest of the BZ reagents. The redox changes in the metal affect the polymer-solvent interactions, resulting in variations in the gel volume. The self-oscillation of the gel volume, and the traveling waves of local swelling in a hydrogel with the BZ reaction have been experimentally observed by Yoshida and co-workers. To describe the system theoretically, we employ the Oregonator model of the BZ reaction, and the two-fluid model of gel dynamics. Propagation of one-dimensional wave trains through the reactive gel is simulated. The structure of the traveling swelling-deswelling waves is studied.

Keywords

polymerchemical reactionsimulation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 889: Symposium W – Electroresponsive Polymers and Their Applications , 2005 , 0889-W06-11-V07-11
Copyright
Copyright © Materials Research Society 2006

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