Preparation and properties of polyaniline doped with poly(thiophenylenesulfonic acid)

✍ Scribed by Kenji Miyatake; Jun-Sang Cho; Shinji Takeoka; Eishun Tsuchida

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 75 KB
• Volume: 200
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/(sici)1521-3935(19991201)200:12<2597::aid-macp2597>3.0.co;2-o

✦ Synopsis

A novel polyaromatic acid, poly(thiophenylenesulfonic acid) (PTPSA), prepared from a soluble precursor of poly(arylenesulfonium salt) was employed as a dopant for polyaniline (PAn). The electro-oxidative polymerization of aniline in PTPSA aqueous solution gives an electroactive PAn/PTPSA composite with three redox couples at 0.16, 0.53, and 0.71V (vs. SCE). Composites of different molar ratio ([SO 3 H]/[An] = 0.10, 0.21, 0.42, 0.50, 0.83, 1.67) was prepared in order to confirm the transformation from the emeraldine base to its PTPSA salt, where a quantitative doping reaction was observed by means of UV-VIS and IR measurements. The thermogravimetric analysis revealed that the composites do not decompose up to 200 8C in nitrogen atmosphere. The composite ([SO 3 H]/[An] = 0.50) shows an electrical conductivity of 1.5 S N cm -1 at 30 8C and 3.0610 -1 S N cm -1 at 170 8C. The composite retains its conductivity after heating at 150 8C for 24 h.