Electrochemical applications of the bending beam method. 2. Electroshrinking and slow relaxation in polypyrrole

Cyclic voltammetry of chloride-doped polypyrrole (PPy(Cl)) in an aqueous solution of tetraethylammonium chloride and dodecyl benzenesulfonate-doped polypyrrole (PPy(DBS)) in an aqueous solution of sodium dodecylbenzenesulfonate is studied. Emphasis is put on the effect of holding the polymers at the negative or positive potential limit on the subsequent cyclic voltammograms. The bending beam method is used to detect the volume changes in PPy(Cl) and PPy(DBS) during doping and undoping under constant potentials and while the polymers are held at the undoped or doped state.