Abstract
Electrochemically prepared polypyrrole films have metallic conductivities in the range 40–100 S cm −1 whereas poly- N-methyl pyrrole films have conductivities more typical of a semiconductor, t/ if 10 −3 S cm −1. Films made by the electrochemical polymerization of mixtures of pyrrole and N-methyl pyrrole have redox potentials intermediate between those of either monomer, indicating that they are in fact random copolymers. The electrical conductivity and thermopower measured as a function of copolymer composition show no evidence for an abrupt metal-semiconductor transition. All these polymers are stable in air to temperatures in excess of 100°C.
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