Conductivity of colloidal polyaniline dispersions

Conductivity of polyaniline dispersions stabilized in aqueous medium with poly(N-vinylpyrrolidone) is related to the prediction for the model system composed of conducting spheres dispersed in a continuous medium. The behaviour of as-prepared dispersion, dispersions dialysed against dilute hydrochloric acid and water, and dispersions based on dry particles redispersed in water is reported, An increase in conductivity of the reaction mixture during the polymerization of aniline is discussed in connection with simultaneous changes in acidity and temperature. The use of conductometry in monitoring the aniline polymerization is illustrated on reactions carried out at various temperatures. The course of dispersion and precipitation polymerizations, as reflected by conductivity measurements, is compared. (C) 2000 Elsevier Science Ltd. All rights reserved.