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Raman spectroelectrochemical study on the kinetics of electrochemical degradation of polyaniline

Authors
Journal
Polymer Degradation and Stability
0141-3910
Publisher
Elsevier
Publication Date
Volume
93
Issue
10
Identifiers
DOI: 10.1016/j.polymdegradstab.2008.07.028
Keywords
  • Polyaniline
  • Degradation
  • Stability
  • Kinetics
  • Raman Spectroscopy
  • Spectroelectrochemistry
Disciplines
  • Chemistry

Abstract

Abstract The kinetics of electrochemical degradation of polyaniline and a copolymer of aniline and metanilic acid have been studied by in situ Raman spectroscopy at a gold electrode. It has been concluded that probably no drastic changes in polymer structure occur on prolonged electrochemical treatment of polymer films at a high electrode potential (0.8 V vs. Ag/AgCl). Instead, most prominent changes relate to a gradual decrease of an overall intensity of spectra, viz. to gradual degradation of a polymer layer. The degradation proceeds faster at pH 1.0, compared to pH 7.0. The kinetic results obtained have been analyzed following simple 2- or 3-parameter exponential decay equations, and compared with the known degradation rate constants.

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