Temperature effect's on the relaxation of poly(aniline) and poly(o-toluidine)

The temperature dependence of the relaxation of poly(aniline) (Pani) and poly (o-toluidine) (POT) in aqueous eutectics of H2SO4 and HClO4, in the temperature range 200 K < T < 300 K, was investigated. As the temperature decreased the anodic peak parameters, E-p,E-a increased, Delta E-1/2,E-a increased, and j(p,a) decreased. The data is interpreted qualitatively within the framework of the extended Feldberg's model, which takes into account the capacitive current contribution to the total current as well as the interaction between neighboring redox centers. The results agree with other experimental observations related to the relaxation of the polymer films. The temperature dependence of the change in the anodic peak parameters shows that the polymer relaxation decreases as the temperature is decreased. The relaxation can be explained through a kinetic process with a rate constant depending on the degree of advance of the reaction (Elovich kinetics). (c) 2005 The Electrochemical Society. All rights reserved.