In-situ polymerized polyaniline films 6. FTIR spectroscopic study of aniline polymerisation

Polyaniline was prepared by the oxidative polymerization of aniline hydrochloride with ammonium peroxydisulfate in aqueous medium. The progress of polymerization was monitored in situ by FTIR spectroscopy after depositing a droplet of the reaction mixture on a ZnSe crystal. The growth of polyaniline film at the crystal surface, as well as changes proceeding in the surrounding aqueous phase, is reflected in the spectra. The processes occurring during polymerization are discussed with the help of differential spectra.