ION-EXCHANGE IN THE ELECTROCHEMICAL SWITCHING OF POLYPYRROLES IN ACETONITRILE BY THE ELECTROCHEMICAL QUARTZ-CRYSTAL MICROBALANCE - ELECTROLYTE INCORPORATION BY HYDROGEN-BONDING OF ANIONS TO PYRROLE

Ion movement in the dedoping-doping process of polypyrroles in acetoni trile has been investigated by the electrochemical quartz crystal micr obalance on selected polypyrroles with and without N-alkyl substitutio n. The dedoping process involves reversible anion explusion for the fo rmer but irreversible cation incorporation for the latter. Electrolyte uptake by the polymer promoted by the polar pyrrole moieties accounts for the behavior of the N-unsubstituted polypyrroles.