Add time:08/25/2019         Source:sciencedirect.com

The effects of varying the oxidantmonomer ratio in the polymerization of aniline, N-phenyl-p-phenylenediamine and N,N′-diphenylbenzidine in a hydrochloric acid solution of (NH4)2S2O8 were investigated. With the first two monomers, increasing the oxidantmonomer ratio from 0·3 to 3 results in a substantial increase in polymer yield but the extent of covalent bond formation between chlorine and the polymer is also increased. In addition, differences in the NC and imineamine ratios, and in thermal stability, are evident in the polymers synthesized at different oxidantmonomer ratios. The degree of polymerization of N,N′-diphenylbenzidine is low and it exhibits a very high susceptibility to chlorine substitution in the reaction mixture. A comparison of the extent of chlorine substitution is made among polymers synthesized in (NH4)2S2O8HCl, and polyaniline base and aromatic amine monomers treated with HCl of the same concentration.

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