Thermal stability of polyaniline

Abstract The thermal stability of conductive polyaniline prepared by the chemical oxidation of aniline with ammonium persulfate in hydrochloric acid was investigated by a heat-aging test at 150 °C. The stability in terms of electrical conductivity was found to depend upon the sample form as well as on the environment. The extent of deterioration in electrical conductivity decreased in the order of the powder in air, the disk in air and the powder in vacuo . From the elemental analysis, infrared and Raman spectroscopies, X-ray photoelectron spectroscopy and electron probe micro-analysis, the deterioration in the presence of air was assumed to be based on the chemical change involving the elimination of hydrochloric acid on the amino group and the simultaneous chlorination of the aromatic ring.

[1]  N. Oyama,et al.  IR absorption spectroscopic identification of electroactive and electroinactive polyaniline films prepared by the electrochemical polymerization of aniline , 1984 .

[2]  W. R. Salaneck,et al.  Physical Characterization of Some Polyaniline, (øN)x , 1985 .

[3]  E. Geniés,et al.  Redox mechanism and electrochemical behaviour or polyaniline deposits , 1985 .

[4]  Stuart I. Yaniger,et al.  “Polyaniline”: Interconversion of Metallic and Insulating Forms , 1985 .

[5]  A. Syed,et al.  Electrochemical Study Of Polyaniline In Aqueous And Organic Medium. Redox And Kinetic Properties. , 1985 .

[6]  Hideo Tamura,et al.  Electrochemical reactions concerned with electrochromism of polyaniline film-coated electrodes , 1984 .

[7]  G. Wnek.  A proposal for the mechanism of conduction in polyaniline , 1986 .

[8]  A. F. Richter,et al.  Polyaniline: a new concept in conducting polymers , 1987 .

[9]  Alan G. MacDiarmid,et al.  ‘Polyaniline’: Protonic acid doping of the emeraldine form to the metallic regime , 1986 .

[10]  T. Hagiwara,et al.  Synthesis and properties of electrically conducting polymers from aromatic amines , 1987 .

[11]  A. Green,et al.  CCXLIII.—Aniline-black and allied compounds. Part I , 1910 .

[12]  J. A. Logan,et al.  Electroactive polyaniline films , 1980 .

[13]  J. Yano,et al.  Basic Behaviors and Properties of the Electrodeposited Polyaniline , 1984 .

[14]  W. R. Salaneck,et al.  A two-dimensional-surface ‘state diagram’ for polyaniline , 1986 .