Abstract
Films of poly(ethylene sulfide) (PES) and poly(propylene sulfide) (PPS) adherent to Pt surfaces are obtained by electrochemical oxidation of ethylene sulfide (ES) and propylene sulfide (PS) in CH 3CN + N(Bu) 4CIO 4 medium. The electropolymerization process results from the formation of two distinct ES .+ (or PS .+) and CIO . 4 species produced by oxidation of ES (or PS) and CIO − 4 and formed at very close potentials. The propagation occurs by a cationic ring-opening step involving sulfonium salts. The polysulfide films are partially oxidized (about 1 4 of the sulfur atoms are positively charged) and are neutralized by the CIO − 4 ions. They are characterized by a high crystallinity, and their electrical conductivity is close to that of semi-conductors (σ = 10 −8 S cm −1).
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