Conformational transition in polyaniline films - Spectroscopic and conductivity studies of ageing |
| |
Authors: | Ivana Šeděnková Miroslava Trchová Jaroslav Stejskal |
| |
Institution: | a Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06 Prague 6, Czech Republic b Charles University Prague, Faculty of Mathematics and Physics, 182 00 Prague 8, Czech Republic |
| |
Abstract: | Polyaniline films were produced in situ at room temperature from aniline hydrochloride oxidized with ammonium peroxydisulfate on glass surfaces immersed in an aqueous reaction mixture. A notable change in the character of the time dependence of resistivity at fixed temperature was observed when the temperature of ageing exceeded 85 °C. The ageing was much faster above this limit. This observation is reflected in the FTIR spectroscopic measurements on the aged protonated, as well as deprotonated, samples. The FTIR spectral variation may be explained by a conformational transition of the polymer chain at about 85 °C. The fact that a similar transition has been found with deprotonated samples indicates that this feature is an inherent property of polyaniline, and is not caused by the acid component of the PANI salt. |
| |
Keywords: | Polyaniline Conducting polymer Thin films Thermal transition Conductivity FTIR spectra |
本文献已被 ScienceDirect 等数据库收录! |