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• W2028343178 abstract "This is the first report on the analysis of random block polysulfide copolymers containing different amounts of repeating units in the copolymer backbone, which has been studied by direct pyrolysis mass spectrometry (DPMS) and by pyrolysis−gas chromatography/mass spectrometry (Py−GC/MS). The homopolymers such as poly(ethylene sulfide) (PES), poly(styrene sulfide) (PSS), and two random copolymers, viz., poly(ethylene sulfidex-co-styrene sulfidey) [copolymer I (x = y = 0.5) and copolymer II (x = 0.74, y = 0.26)] were investigated by both DPMS and Py−GC/MS (except copolymer II) techniques. In the case of copolymer I, the thermal degradation products of SE1, SE2, S2, and S2E (S = styrene sulfide, E = ethylene sulfide) were detected in DPMS, whereas the formation of SE1 and SE2 were observed by Py−GC/MS technique. However, for copolymer II, SE3 was also found along with SE1, SE2, S2, and S2E in DPMS. The formation of additional product (SE3) observed in copolymer II could be due to an increase in the block length formed during copolymerization. Further, a comparative study on thermal degradation of PES, poly(ethylene disulfide) (PEDS), and poly(ethylene tetrasulfide) (PETS) were investigated by Py−GC/MS. The pyrolysis products detected by both DPMS and Py−GC/MS indicates that the thermal decomposition of these polymers yield cyclic sulfides through an intramolecular exchange or by backbiting processes. The linear products with thiol and vinyl groups were also observed by Py−GC/MS along with the cyclic products via carbon hydrogen transfer reaction." @default.
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• W2028343178 date "2002-03-19" @default.
• W2028343178 modified "2023-10-12" @default.
• W2028343178 title "Thermal Degradation Processes in Polysulfide Copolymers Investigated by Direct Pyrolysis Mass Spectrometry and Flash Pyrolysis−Gas Chromatography/Mass Spectrometry" @default.
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• W2028343178 doi "https://doi.org/10.1021/ma0116250" @default.
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