Polyaniline: Processability from aqueous solutions and effect of water vapor on conductivity

✍ Scribed by Angelopoulos, Marie; Ray, Anjan; Macdiarmid, Alan G; Epstein, Arthur J

• Book ID: 123202645
• Publisher: Elsevier Science
• Year: 1987
• Tongue: English
• Weight: 554 KB
• Volume: 21
• Category: Article
• ISSN: 0379-6779
• DOI: 10.1016/0379-6779(87)90062-2

✦ Synopsis

The chemically-synthesized emeraldine base form of polyaniline is soluble in aqueous acetic acid solutions, in which it presumably exists as the 'doped' emeraldine acetate salt. Films having a conductivity of ~ 0.5 -2 S/cm may be cast from the solutions. These films may be converted to relatively flexible, free-standing, lustrous, copper-colored films of emeraldine base, which can in turn be converted to free-standing, lustrous, dark blue films of emeraldine hydrochloride (a ~ 1 -2 S/cm). The resistance of films of both emeraldine base and 50% protonated emeraldine hydrochloride decreases by a factor of ~ 2 when exposed to ~ 4 Torr of water vapor. The resistance increases only very slowly on removing the water vapor under dynamic vacuum, consistent with the postulated structure of emeraldine hydrochloride involving 'islands' of heavily-doped emeraldine base in a matrix of undoped or slightlydoped material.