ИСТИНА

Polypyrrole (PPy) films were electrochemically synthesized in the presence of water-soluble polysulfonic acids and their sodium salts: poly(2-acrylamido-2-methyl-1-propanosulfonic acid) (PAMPSA, flexible backbone); poly(styrene-4-sulfonic acid) (PSSA, flexible backbone), poly-(p,p’-(2,2’-disulfonic acid)-diphenylene-iso-phthalamide) (i-PASA, semi-rigid backbone); poly-(p,p’-(2,2’-disulfonic acid)-diphenylene-tere-phthalamide) (t-PASA, rigid backbone) in aqueous solutions. The pyrrole electropolymerization was performed in potentiostatic (PS), galvanostatic (GS) and cyclic voltammetry (CV) regimes and the results were compared with common synthesis of PPy in aqueous solutions with inorganic electrolytes. It was shown that PPy electrosynthesis in the presence of polyelectrolytes both in acid and salt form proceeds at high rate and sufficiently low concentration of monomer. The course of synthesis and polymerization rate depends strictly on the structure of polyelectrolyte and the nature of its cation. The lower induction period in PS regime and lower potential in GS regime of pyrrole electropolymerization in the presence of acid forms of flexible-chain polyelectrolytes compared to their sodium forms was observed. In the case of semi-rigid-chain polyelectrolyte in acid form PPy electrosynthesis has non-autocatalytic character in PS and GS regimes. The differences in morphology and properties of obtained PPy films studied by AFM-microscopy, Vis-NIR spectroscopy, cyclic voltammetry and Vis-NIR spectroelectrichemistry were also found.