Thermal degradation mechanism of poly(arylene sulfone)s by stepwise Py-GC/MS

IR laser ablative degradation of poly(phenylene ether-sulfone): Deposition of films containing ether, sulfone, sulfoxide and sulfide groups

“…The detected gaseous products and the spectral properties of the deposited films show that the IR laser-induced and the conventional degradation [6,7,9,10] of PES remarkably differs in products. The latter yields diphenyl compounds (Ph 2 , Ph 2 O, Ph 2 S, PhSO 2 Ph), SO 2 and phenol and a carbonaceous char.…”

“…Thermal behaviour of the simplest member of these polymers, poly(1,4-(phenylene ether-sulfone)) (PES) has been intensely studied applying pyrolysis and EPR spectroscopy [6] thermogravimetry [7,8] and combination of thermogravimetry or pyrolysis with mass spectrometry and gas chromatography [9][10][11]. Diphenyl sulfone, diphenyl ether and diphenyl are the decomposition products at lower (250-400 C) temperatures [7].…”

“…Diphenyl sulfone, diphenyl ether and diphenyl are the decomposition products at lower (250-400 C) temperatures [7]. At higher temperatures [6,7,9,10], thermal decomposition of PES occurs as a one-stage main-chain random scission and carbonisation, yielding SO 2 , phenol (major products), diphenyl sulfone, diphenyl ether and a char. The char was believed (but not proved) to have a polyphenylene structure when formed at 535-580 C and a cross-linked structure when formed at above 950 C. In these studies, polymer degradation occurs through heat transfer from heating elements or reactor walls; it is controlled thermodynamically and possibly assisted by heterogeneous catalysis.…”

Thermal degradation mechanism of poly(ether imide) by stepwise Py-GC/MS

“…There are numerous studies of the degradation behavior of polyimide in the literature. Zurakowska-Orszagh et al 1 used IR spectroscopy and 13 C NMR to analyze the thermal degradation mechanism of polyimides with isoimide cycles. Hu et al 2 pyrolyzed polyimide thin films over 500°C.…”

“…10,11 Recently, I used multistage or stepwise pyrolysis to study the pyrolysis of poly-(ether ether ketone) and poly(arylene sulfone)s by Py-GC/MS with consecutive heating of the sample at fixed temperature intervals to achieve narrow temperature (ϳ100°C) pyrolysis conditions. 12,13 This method revealed the temperature dependence of individual pyrolysate formations, and the dominant pyrolysis mechanisms in different temperature regions were obtained. In this work, Py-GC/MS was also used to analyze the pyrolysis behaviors of PEI to identify the pyrolysates and mechanisms.…”