Enhanced thermal stability of polypyrrole hexagonal microplates fabricated by organic crystal surface-induced polymerization

The stability of polypyrrole hexagonal microplates (PHMs) fabricated by organic crystal surface-induced polymerization (OCSP) in the presence of 4-sulfobenzoic acid monopotassium salt (SBAK) crystals was examined during thermal aging at 150 °C for 10 h under air and nitrogen atmospheres. Thermal sta...

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Bibliographic Details
Published in:Polymer degradation and stability 2011-05, Vol.96 (5), p.778-783
Main Authors: Jeon, Sang Soo, Lee, Young Woo, Im, Seung Soon
Format: Article
Language:English
Subjects:
Ageing
Applied sciences
Conducting polymer
Degradation
Electrical resistivity
Exact sciences and technology
Organic crystals
Physical properties
Polymer industry, paints, wood
Polymerization
Polypyrrole
Polypyrroles
Properties and testing
Spectroscopy
Stability
Surface resistivity
Technology of polymers
Thermal stability
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Summary:The stability of polypyrrole hexagonal microplates (PHMs) fabricated by organic crystal surface-induced polymerization (OCSP) in the presence of 4-sulfobenzoic acid monopotassium salt (SBAK) crystals was examined during thermal aging at 150 °C for 10 h under air and nitrogen atmospheres. Thermal stability of PHMs and conventional polypyrroles (CPPys) was evaluated in terms of the resistivity ( R t ) after aging for t h, normalized to the initial resistivity ( R 0) before aging, R t / R 0. Although the PHMs maintained R 10/ R 0 values of 21.9 and 3.0 under air and nitrogen, respectively, the CPPys exhibited much higher R 10/ R 0 values, of 853.8 and 14.6, respectively. A possible explanation for the enhanced thermal stability of the PHMs is the higher thermal stability and the antioxidant effect of SBAK dopant molecules. Thermo-oxidative degradation was accelerated due to direct chemical attack on the cationic pyrrole rings of atmospheric water and oxygen, leading to a steep increase in surface resistivity. The development of carbonyl defects on PPy chains during thermal aging was monitored using Fourier transform-infrared (FT-IR) spectroscopy and X-ray photoelectron spectroscopy (XPS). Ultraviolet–visible (UV–vis) spectroscopy revealed that the PHMs essentially retained the bipolaron structures, even after thermal aging for 10 h in air, whereas the CPPys showed almost no bipolaron structures.
ISSN:0141-3910
1873-2321
DOI:10.1016/j.polymdegradstab.2011.02.018