Copolymer films of aniline with o-aminobenzonitrile were electrochemically synthesized under centrifugal acceleration ranging from 1 to ca. 300 g. The copolymerization ratio could be controlled by the applied gravitational force. In addition, the effect of the force exerted on the working electrode was found to be anisotropic. Similar trends could also be observed in the electrochemical copolymerizations of 2, 2Ј-bithiophene with pyrrole and N-methylpyrrole. A mechanism for the electrochemical deposition of the copolymers under centrifugal force has also been proposed.
This work presents a detailed study of the mechanism for the electrochemical deposition of conjugated polymers on anodes in centrifugal fields. The rate of the electrochemical deposition of polyaniline was affected significantly by a centrifugal acceleration force of 315 g. However, no centrifugal effects were observed on the electrochemical deposition of poly(3,4-ethylenedioxythiophene). It was found that the degree of the centrifugal effect generated depended greatly on the size of the oligomer aggregates just before their deposition. To further confirm the influence of size on electrochemical systems under centrifugal fields, we also carried out an electrochemical redox reaction using various sizes of vinylferrocene-immobilized polystylene latex particles.
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