Oligomer-immobilizing ability of an electrodeposited aramid resin film in the electrooxidation of aniline derivatives and the functions of the resulting films

An aramid resin, poly(p-phenylene terephthalamide) (PPTA), was electrodepos ited on an indium-tin oxide electrode as a mechanically stable film from a dimethyl sulfoxide solution. Two aniline derivatives, o-phenylenediamine an d o-aminophenol, were electrooxidized from H2SO4 aqueous solutions using th e PPTA film-coated electrode. The PPTA film was permeable to the aniline de rivatives, and the derivatives were electrooxidized on the electrode surfac e. When the derivatives were electrooxidized, the film immobilized the corr esponding oligomer species as well as the polymers plain (o-phenylenediamin e) (PoPD) and poly(o-aminophenol) (PoAP), and the deposited amount of the p olymers was increased by the PPTA film. The immobilized amount of PoAP was greater than that of PoPD because of the 1,4-substituted structure of PoAP. In the PPTA film, both PoPD and PoAP were electronically stabilized, and t hey became durable against oxidative degradation.