Abstract
The water-soluble polypyrrole, poly[4-(3-pyrrolyl)butanesulfonic acid] (P3PyBSH), in which the β-position of pyrrole ring is substituted with n-butanesulfonic acid group, is synthesized by oxidation polymerization of 3PyBSNa followed with an ion-exchange of Na+ with H+. It can be cast into free-standing film from its aqueous solution and has a conductivity of 4.0×10−4 S/cm, higher than that of its sodium salt (5.5× 10−6 S/cm) by about 2 orders. The increase in conductivity is attributed to the self-doping by the protons originally on the side chains as supported by the absence of the anion FeCl4 − (which generates during the polymerization) and the presence of polaron and bipolaron characteristics in its UV-Vis and IR spectra.
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Chang, EC., Hua, MY. & Chen, SA. Synthesis and properties of the water-soluble self-acid-doped polypyrrole: poly[4-(3-pyrrolyl)butanesulfonic acid]. J Polym Res 5, 249–254 (1998). https://doi.org/10.1007/s10965-006-0064-5
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DOI: https://doi.org/10.1007/s10965-006-0064-5