Chemical Oxidation Polymerization Of Polypyrrole And Applied Research

PPy was synthesized in the mesh and on the surface of cellulose membrane by oxidative chemical polymerization. The effect of various oxidants on the conductivity and thermal stability of PPy/cellulose composite conducting membrane were investigated. The corrosive action of various oxidants on the aluminum oxide foil was studied. The results show that (NH4)2S2O8 was the appropriate oxidant used in the preparation of aluminum electrolytic capacitors with PPy electrolyte.The conductivity, thermal stability and impedance-frequency characteristics of composite conducting membrane prepared by various dopants were investigated. The results show that the conductivity reached the highest when TSA was used as a dopant, the thermal stability was enhanced when SDS, DBSA or HC1 was used as a dopant, the impedance became lower with the increase of frequency when the HC1 or DBSA was used as a dopant. The effect of the applied electric field on the conductivity of composite conducting membrane was also investigated. The results show that the conductivity lowered with the increase of the applied electric field intensity. PPy powder was synthesized and its thermal aging characteristics were studied. The results show that the aging of PPy proceeded much faster in the presence of oxygen than in its absence.Aluminum electrolytic capacitors with PPy electrolyte were fabricated. The properties of capacitors were studied. The technological process of preparation of capacitors were investigated.