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New Electrochemical Synthesis Of Electronic And Ionic Conductive Polymer Composites
Published 1989 · Chemistry
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Abstract Electronic and ionic conductive polymer composites have been synthesized by electropolymerization using pyrrole, bithiophene or aniline trifluoromethane sulfonate with a stiff, hydrophobic, perfluorinated ionomer (Nafion ® type) gel. An inert aqueous electrolyte was also used to insure the ionic conduction in the cell. The composites obtained have a high (1000 S cm −1 ) conductivity along with good mechanical properties (especially when they are annealed under pressure). A variety of more rigid composites may be obtained in an analogous way by adding finely powdered polypyrrole to the gel. Another method was found to be also quite efficient because it allows the electropolymerization of the polyheterocycles into a swollen Nafion membrane inserted between the electrode and the electroactive gel prior to polymerization. These composite membranes also have high electronic conductivity and good mechanical properties which resemble the initial unmodified membranes. The composition and characteristics of the final polymers were investigated in relation to the composition of the initial gel, the polymerization currents and the applied potentials. A qualitative interpretation of the composite structure is proposed based on these data and previous knowledge of Nafion gels.