Protonation Degree of Doped Polyaniline with Sulfosalicylic Acid as Function of the Synthetic Method
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.
Yuan Ming Huang
H. Huang et al., "Protonation Degree of Doped Polyaniline with Sulfosalicylic Acid as Function of the Synthetic Method", Materials Science Forum, Vols. 663-665, pp. 462-465, 2011