کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5187575 | 1381132 | 2008 | 6 صفحه PDF | دانلود رایگان |
Polyaniline (PANI) (emeraldine) base has been exposed to iodine in an ethanol-water suspension. The conductivity of PANI increased from 10â9Â SÂ cmâ1 to 10â4Â SÂ cmâ1 already at the molar ratio [I2]/[PANI]Â =Â 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]Â =Â 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.
Journal: Polymer - Volume 49, Issue 1, 10 January 2008, Pages 180-185