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Polyaniline: an Old Polymer with New Physics

Published online by Cambridge University Press:  25 February 2011

A. J. Epstein and
A. G. MacDiarmid
A. J. Epstein
Affiliation:
The Ohio State University, Department of Physics and Department of Chemistry, Columbus, OH 43210-1106
A. G. MacDiarmid
Affiliation:
University of Pennsylvania, Department of Chemistry, Philadelphia, PA 19104
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Abstract

Polyanilines have been known for over one hundred years. Recent studies of this chemically flexible polymer have demonstrated unusual electronic phenomena in both the insulating forms and the conducting forms. Studies of both forms show that the origins of the electronic phenomena are substantially different than those observed in polyacetylene and related earlier studied conjugated carbon backbone polymers. Unusual aspects include the formation of massive polarons upon photoexcitation in the insulating forms. These polarons have unusual time dynamics associated with the roles of ring-flipping and ring-conformation in the polymer system. A new model for the effects of electron lattice coupling via ring rotation has been introduced. The “metallic” form of the polymer shows that the metallic state is associated with the ordered regions of the doped polymer. The roles of localization are important in leading to the formation of a textured, granular metal. At low temperatures for emeraldine salt, and at higher temperatures for derivatized polyanilines, localization is important. Potential new technologies based on the polyanilines, including optical information storage, controlled microwave absorption, and use of a self-protonating derivative that is soluble in aqueous media are noted.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 173: Symposium Q – Advanced Organic Solid State Materials , 1989, 293
Copyright
Copyright © Materials Research Society 1990

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