Abstract
Electrochemical copolymerization of pyrrole and thiophene has been accomplished using an acetonitrile solution containing 0.1M thiophene and 
pyrrole. The production of copolymers was evidenced by IR measurements of the resulting polymers and their electrochemical properties. The electrochemical behavior of the copolymers is gradually changed from that of polypyrrole to polythiophene with an increase of the thiophene rings in the copolymers, reflecting that the ratio of pyrrole to thiophene rings in the copolymer can easily be changed by changing oxidation potential.