Synthesis and properties of the water-soluble self-acid-doped polypyrrole: poly[4-(3-pyrrolyl)butanesulfonic acid] |
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Authors: | En-Chung Chang Mu-Yi Hua Show-An Chen |
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Affiliation: | (1) Chemical Engineering Department, National Tsing-Hua University, Hsinchu, 30013, Taiwan, ROC |
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Abstract: | The water-soluble polypyrrole, poly4-(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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Keywords: | Water-soluble conjugated conducting polymer Self-acid-doped polypyrrole |
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