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Polyaniline: Interrelationships Between Molecular Weight, Morphology, Donnan Potential and Conductivity

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Abstract

Methods for significantly increasing the molecular weight of polyaniline are described. The conductivity of doped polyaniline is shown to be more directly dependent on its degree of alignment/crystallinity than on its molecular weight. The tensile strength of polyanilines films and fibers increases with increasing stretch alignment. An interpenetrating polymer system involving polyaniline which shows greatly enhanced conductivity at pH values where polyaniline has negligible conductivity is described. The doping level of polyaniline is shown to be dependent not only on the pH of the dopant medium but also on the presence of dissolved neutral salts. This new phenomenon is explained in terms of Donnan equilibrium effects.

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References

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Acknowledgement

This work was supported by the U. S. Defense Advanced Research Projects Agency (DARPA) through a contract monitored by the U. S. Office of Naval Research. The authors wish to thank in particular, Mr. Gabriel E. Asturias for preparing for presentation at short notice his studies on the Interpenetrating Polymer System and Donnan effects, and Mr. Michael A. Mancini for his creative and untiring efforts in preparing this manuscript.

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Authors and Affiliations

  1. Department of Chemistry, University of Pennsylvania, Philadelphia, PA, 19104-6323, USA

    Alan G. Macdiarmid

  2. ]Department of Physics & Department of Chemistry, The Ohio State University, Columbus, OH, 43210-1106, USA

    Arthur J. Epstein

Authors
  1. Alan G. Macdiarmid
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  2. Arthur J. Epstein
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Macdiarmid, A.G., Epstein, A.J. Polyaniline: Interrelationships Between Molecular Weight, Morphology, Donnan Potential and Conductivity. MRS Online Proceedings Library 247, 565–576 (1992). https://doi.org/10.1557/PROC-247-565

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