Polyaniline prepared in solutions of phosphoric acid: Powders, thin films, and colloidal dispersions

摘要: Abstract Polyaniline (PANI) has been prepared by the oxidation of aniline with ammonium peroxydisulfate in 0–4 M phosphoric acid. The maximum conductivity PANI, 15.5 S cm −1 , was found PANI presence 1 M mass loss after deprotonation hydroxide revealed that relatively large amounts acid were associated if polymerization had carried out at higher concentration. This suggests protonation both imine and amine nitrogens increased adsorption or polyphosphate counter-ions. increasing content is also reflected increase sample density. FTIR spectra salts collected proved counter-ions sulfate type, resulting from decomposition peroxydisulfate, always participated PANI. proportion to phosphate reduced as concentration medium increased. Thin films produced situ on glass surfaces immersed reaction mixture during aniline. Optical absorption used assess their thickness, 70–140 nm, which be virtually independent film comparable powders same time. Colloidal dispersions obtained when contained poly( N -vinylpyrrolidone). particle size, 200–260 nm, polydispersity, determined dynamic light scattering, dispersion thinner, 20–90 nm, compared those grown precipitation polymerization.