Abstract
We present the first open-circuit-potential (OCP) study of the chemical polymerization of aniline in the presence of various aromatic additives and demonstrate the feasibility of monitoring the polymerization rate by the OCP technique. With (NH 4) 2S 2O 8 as oxidant, there are three stages in the OCP-reaction time plots. The time ( t 1 + t 2) needed for completion of the first two stages is inversely related to the rate of polymerization. The presence of p-aminodiphenylamine, N, N′-diphenylhydrazine, benzidine and p-phenylenediamine reduces the t 1 + t 2 value and therefore increases the rate of polymerization. In contrast, the presence of p-hydroquinone increases the t 1 + t 2 value and thus reduces the polymerization rate. These preliminary results are consistent with the kinetics and mechanism of the electrochemical polymerization of aniline.
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