The chemical polymerization of o-toluidine was carried out in dimethylformamide=aqueous HCl solution using benzoyl peroxide. The conductivity of poly(o-toluidine) (POT) doped with HCl changed from 2.0 Â 10 À4 to 15.6 Â 10 À4 S cm À1 depending on the polymerization parameters. The solubility of POT in DMSO was found as 0.3 g=100 mL, in which the solubility of HCl-doped polyaniline was 0.042 g=100 mL. Characterization of synthesized POT was performed by conductivity, solubility, FT-IR, UV-vis, and TGA techniques. Thermal-sensing property of POT was also investigated between À10 and þ120 C by heating-cooling cycles.
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