Abstract
Lines were drawn on polyaniline (PANI) salt films with laser beam, and then the samples were left to age in air at room temperature. Both the irradiated and intact parts of the sample and their ageing were studied with Raman spectroscopy. It was found that the laser-written record is reasonably stable. The degradation of polyaniline by laser irradiation and ageing was compared to the changes in PANI during heating. In all cases, deprotonation and crosslinking of PANI chains proceed but the relative rates of the processes vary with degradation conditions.
Highlights
Conducting polymers, such as polyaniline (PANI), are widely studied due to their ease of preparation, good level of electrical conductivity, redox and ion-exchange properties, and environmental stability [1,2,3,4,5,6,7,8]
When PANI salt is exposed to elevated temperature, the changes at the molecular level manifest themselves by the loss of doping acid molecules and formation of phenazinelike or quinonoid segments [9]
Polyaniline was prepared by the oxidation of 0.2 M aniline hydrochloride (Fluka, Switzerland) with 0.25 M ammonium peroxydisulfate (APS) (Lach-Ner, Czech Republic) in water [23] at room temperature
Summary
Conducting polymers, such as polyaniline (PANI), are widely studied due to their ease of preparation, good level of electrical conductivity, redox and ion-exchange properties, and environmental stability [1,2,3,4,5,6,7,8]. When PANI salt is exposed to elevated temperature, the changes at the molecular level manifest themselves by the loss of doping acid molecules and formation of phenazinelike or quinonoid segments [9]. Conformation is changed by thermal treatment [14]. This feature is an inherent property of PANI and is not influenced by the nature of the protonating acid. Similar processes take place in PANI salt during ageing at room temperature [15, 16]
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