A study of polypyrrole films formed at the liquid|vapor interface

Electropolymerization of pyrrole from aqueous solutions results in the formation of a thin film at the liquid|vapor interface if the electrode is partially immersed in the liquid phase. The liquid|vapor interface (l-v-i) polymer film grows more rapidly than the polymer on the electrode surface immersed in the monomer solution. Accumulation of surface-active pyrrole monomer or oligomers at the interface causes such film formation. A detailed study of this l-v-i film was carried out and is reported here.