ELECTROGENERATION OF POLYPYRROLE IN PRESENCE OF POLYVINYLSULPHONATE -KINETIC-STUDY

A voltammetric study of a Pt electrode in pyrrole-polyvinylsulphonate (PVS) aqueous solutions, showing different concentrations of the polye lectrolyte was performed. Potential range for the composite (polypyrro le-PVS) reversible redox behaviour for its passivation, and for the wa ter discharge were studied by voltammetry. The electropolymerization o f composite films of polypyrrole-polyvinyl sulphonate was performed un der a constant potential of 800 mV from aqueous solutions. Parallel ki netics through es-situ microgravimetric determination of the dry film weights, through electrical charges consumed during the electropolymer ization, and through electrical charge consumed during the electropoly merization, and through electrical charge stored in the electroactive films were obtained. The polymerization mechanism change along the pol ymerization time, giving low current efficiencies and low storage of c harge per gram of polymer.