Synthesis And Properties Of Poly(3,4-Dimethoxythiophene)

Poly(3,4-dimethoxythiophene) was newly synthesized, and its structure and properties were investigated. The polymerization was carried out by anodic oxidation of 3,4-dimethoxythiophene. Typically, the polymer with perchlorate as a counter ion was obtained as a dark-brown amorphous film and gave a conductivity of 64 S/cm. This film was able to be stretched up to 1.2 times its original length, giving a conductivity of 120 S/cm in the stretched direction. Elemental analysis gave a composition of C 6.00 H 6.40 S 1.00 (ClO 4 ) 0.31 . The as-grown film showed an absorption spectrum with a broad band around 1700 nm, while the undoped film showed a spectrum with peaks at 510(sh), 551 and 598 nm. The DSC curve showed an exothermic peak at 175 °C, probably due to the dissociation of the counter ion.