Structure and electric conductivity of copolymers of aniline and aniline-2-sulfonic acid obtained via chemical oxidative copolymerization

A method for the synthesis of aniline-aniline-2-sulfonic acid copolymers is developed. It is shown that the sulfonated polyaniline is capable of self-doping, as evidenced by higher stabilities of the structure and electric conductivity of the copolymers than those of the homopolymer. The mechanism of electric conductivity of the copolymers depends on the comonomer ratio in the feed. By means of the method of impedance spectroscopy, it is found that a decrease in electric conductivity with an increase in the degree of sulfonation is primarily due to reduction in the order of the copolymer structure.