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Oxidative copolymers of aniline with o-anisidine: their structure and ion exchange properties

Abstract Poly(aniline-co-o-anisidine)s were synthesised by chemical peroxidative copolymerisation of aniline with o-anisidine in aqueous acidic medium under nitrogen atmosphere. The molar feed ratio of the monomers was varied in copolymerisation reaction in order to obtain copolymers of different compositions. The actual monomeric composition in the copolymers was estimated by integrated proton nuclear magnetic resonance spectroscopy. Owing to the difference in reactivities of aniline and o-anisidine, the content of o-anisidine in the copolymer was higher than the monomer taken in the reaction mixture. The electrical conductivity of the copolymers strongly depends on the amount of aniline incorporated, and it decreases with increasing o-anisidine content in the copolymer, which may lower the structural regularity of the copolymer. It is suggested from the temperature dependence of the electrical conductivity that the electrical conduction mechanism of the copolymer is polaron hopping conduction similar to that of homopolymers. The applications of copolymer as anion exchange resin and acid–base indicator are presented.