Thermal degradation products of poly(styrenesulfides) investigated by direct pyrolysis�mass spectrometry and flash pyrolysis�gas chromatography/mass spectrometry

Montaudo, Giorgio and Puglisi, Concetto and Blazò, Marianne and Kishore, K and Ganesh, K (1994) Thermal degradation products of poly(styrenesulfides) investigated by direct pyrolysis�mass spectrometry and flash pyrolysis�gas chromatography/mass spectrometry. In: Journal of Analytical and Applied Pyrolysis, 29 (2). 207-222 .

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Abstract

The thermal degradation products of two sulfur polymers, poly(styrenedisulfide) (PSD) and poly(styrenetetrasulfide) (PST), were investigated in parallel by direct pyrolysis-mass spectrometry (DPMS) and by flash pyrolysis-GC/MS (Py-GC/MS). The time-scale of the two pyrolysis techniques is quite different, and therefore they were able to detect significantly different products in the pyrolysis of PSD and PST because of the thermal lability of sulfur-containing compounds. However, the results obtained are not contradictory, and satisfactory mechanisms for the thermal degradation of PSD and PST have been derived from the overall evidence available. Pyrolysis compounds containing sulfur, styrene, and a number of cyclic styrene sulfides and diphenyldithianes have been observed by DPMS. However, in flash pyrolysis-GC/MS, styrene, sulfur, only one cyclic styrene sulfide, and two isomers of diphenylthiophene have been detected. These thiophene derivatives were indeed absent among the compounds obtained by DPMS because they were the terminal (most thermally stable) species arising from further decomposition of the cyclic styrene sulfides formed in the primary thermal degradation processes of PSD and PST.

Item Type:	Journal Article
Publication:	Journal of Analytical and Applied Pyrolysis
Publisher:	Elsevier science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Direct pyrolysis-mass spectrometry;Flash pyrolysis-gas chromatography/mass spectrometry;Poly( styrenesulfides); Pyrolysis;Thermal degradation mechanism
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	20 May 2011 07:21
Last Modified:	20 May 2011 07:21
URI:	http://eprints.iisc.ac.in/id/eprint/36887

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