JMSSJ On-line

JMSSJ On-line, Vol. 46 (1998) No. 4, pp. 353-356

Effect of Treatment Temperature on Electrical Conductivity of Self-Doped Polyaniline		>> Full Text PDF >> References
*Hiroshi SHIIGI^a), Akihiro OGAWA^a), Masaharu NAKAYAMA^a), and Kotaro OGURA^a)** ^a) Department of Applied Chemistry, Faculty of Engineering, Yamaguchi University (2557 Tokiwadai, Ube 755-8611, Japan)*

Thermal and electrical properties of self-doped polyaniline (PAn) having carboxyl group have been investigated. Thermogravimetry-mass spectrometric (TG-MS) results demonstrated that the carboxyl substituent decomposes in the temperature range between 100 and 350°C, followed by the decomposition of the polymer backbone above 350°C. The substituent was suggested to be in the form of -COO^- and -COOH from the FT-IR measurements. The existence of the negative carboxyl group resulted from the interaction with the positively charged PAn chain. The thermal decomposition of carboxyl group at 150°C and below did not affect the conductivity of the polymer, but it dropped considerably in the decomposition on temperature above 150°C. This observation indicates that the decarboxylation of the -COOH substituent, which is not associated with the dopant anion, proceeds more readily than that of the -COO^- substituent.

Key words: Self-doping, Poly(anthranilic acid), TG-MS, FT-IR, Electrical conductivity, Carboxyl group