Abstract
For the purpose of developing a novel type of electrically conducting polymers, synthesis and properties of electrochemically-doped, non-conjugated vinyl type polymers containing oligothiophenes as pendant groups have been studied. New vinyl monomers, 2-[4-(2-thienyl)-phenyl]-5-vinylthiophene and 5-vinyl-2,2′:5′,2″:5″,2′″-quaterthiophene, have been synthesized, and electrolytic polymerization carried out by controlled potential anodic oxidation. The resulting polymers were identified as partially oxidized radical cation salts with ClO 4-as a dopant, having partially cross-linked structures. The polymers undergo reversible color changes. Electrochemically-doped poly(5-vinyl-2,2′:5′,2″:5″,2′″-quaterthiophene) exhibits room-temperature conductivities of ca. 10 −7 S cm −1 with activation energies of ca. 0.5 eV.
Published Version
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