The reaction of polyaniline with iodine

J. Stejskal , M. Trchová , N.V. Blinova , E.N. Konyushenko , Stephanie Reynaud (1) , J. Prokeš

1 IPREM - Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux

Polyaniline (PANI) (emeraldine) base has been exposed to iodine in an ethanol-water suspension. The conductivity of PANI increased from 10-9 S cm-1 to 10-4 S cm-1 already at the molar ratio [I2]/[PANI] = 1, and a higher content of iodine had only a marginal effect. This is the result of the protonation of PANI base with hydriodic acid, which is a by-product of the oxidation of the emeraldine form of PANI to pernigraniline constitutional units. The reaction is discussed on the basis of FTIR spectra. An alternative reaction, a ring-iodination of PANI, is marginal. Only one iodine atom substitutes a hydrogen atom in about 12 aniline units, even at high iodine concentration, [I2]/[PANI] = 8. The film of polyaniline base can be used in sensing iodine; after exposure to the iodine vapor, the conductivity of the polyaniline film increased. © 2007 Elsevier Ltd. All rights reserved.

Domaines: Polymères; Matériaux

J. Stejskal, M. Trchová, N.V. Blinova, E.N. Konyushenko, Stephanie Reynaud, et al.. The reaction of polyaniline with iodine. Polymer, 2008, 49 (1), pp.180-185. ⟨10.1016/j.polymer.2007.11.023⟩. ⟨hal-01564107⟩