Electrochemical synthesis of sulfonated polypyrrole in FSO3H/acetonitrile solution



The incorporation of SO3 groups into a polypyrrole backbone was successfully carried out using FSO3H/acetonitrile medium. The degree of sulfonation (sulfonation or sulfur-to-nitrogen ratio) of polymer was controlled by varying FSO3H concentration while the film was being electrodeposited. The cyclic voltammograms of the electrodeposited films were taken between −1.00 and +2.00 V (versus Ag/AgCl) in blank solution. A substantial effect on the electrical conductivity was observed upon the incorporation of SO3 groups in the polypyrrole polymeric chain. The elemental analysis results of the freshly prepared and reduced films give independent evidence that the SO3 groups are covalently bound to the structure. FTIR, UV-Vis, spectroscopy and SEM techniques were used to characterize the electrosynthesized polypyrrole films. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 526–533, 2004