Protonation Degree of Doped Polyaniline with Sulfosalicylic Acid as Function of the Synthetic Method

Abstract

X-ray photoelectron spectroscopy (XPS) has been employed to investigate the protonation degree of polyaniline doped with sulfosalicylic acid (PAni-SSA) obtained by different synthetic methods. The protonation degree has been compared to electrical conductivity. Prepared PAni-SSA through the redoping process in an agate mortar displays conductivity values within the range of 1S/cm. Protonation degree of synthesized PAni-SSA by aqueous dispersion polymerization of aniline in the presence of SSA is higher than 50 %, indicating that a substantial portion of amine units have also been protonated. The C/N and S/N molar ratios obtained by XPS analysis indicate that the polyaniline chains obtained by aqueous dispersion polymerization are protonated by both sulfate anions.

Synthesis, characterization and optimization of N‐TiO2/PANI nanocomposite for photodegradation of acid dye under visible light

“…At prolonged reaction time and thus allowing sufficient time for acid exposure, the polymer is undergoing the further protonation by protonic HCl acid. Therefore, the more quinonoid units are converted to benzenoid amine (NH) units by a proton‐induced spin‐unpairing mechanism . Consequently, a lower degree of agglomeration is formed due to the decrease of the imine content in the polymer.…”