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Thermal degradation studies of perchlorate‐doped conductive polymers
Author(s) -
Neoh K. G.,
Kang E. T.,
Tan K. L.
Publication year - 1991
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1991.070430319
Subject(s) - perchlorate , polypyrrole , thermogravimetric analysis , chlorine , polymer , materials science , aniline , thermal decomposition , x ray photoelectron spectroscopy , polymer chemistry , inorganic chemistry , conductive polymer , chemical engineering , chemistry , organic chemistry , polymerization , ion , composite material , metallurgy , engineering
The thermogravimetric behavior of polypyrrole (PPY), polybithiophene (PBT), and poly‐aniline (PAN) perchlorate complexes and their corresponding base polymers have been studied. The PBT–perchlorate complex and base polymer decompose at significantly lower temperatures than do the PPY and PAN counterparts. All three perchlorate complexes retain half or more of their original conductivities with no changes in the doping levels after one cycle of heating to 150°C in air and cooling to room temperature. However, after heating at 150°C for 24 h, only the PAN–perchlorate complex shows no significant change in the doping level, although its conductivity decreases by more than two orders of magnitude. X‐ray photoelectron spectroscopy analyses of the perchlorate complexes reveal the presence of at least two distinct chlorine species. The thermal decomposition of the perchlorate anions results in the formation of volatile chlorine species as well in chlorine covalently bonded to the polymer. The thermal decomposition of the PPY–perchlorate complex also results in the conversion of positively charged nitrogens to iminelike structures.