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Copolymerization of elemental sulfur with cyclic(arylene disulfide) oligomers

✍ Scribed by Yong Ding; Allan S. Hay

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 146 KB
Volume: 35
Category: Article
ISSN: 0887-624X
DOI: 10.1002/(sici)1099-0518(199710)35:14<2961::aid-pola17>3.0.co;2-h

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✦ Synopsis

Copolymerization reactions between cyclic(arylene disulfide) oligomers were studied. The cyclic disulfide oligomers derived from 4,4-isopropylidene bisbenzenethiol gave soluble polysulfanes via copolymerization with S 8 . The copolymerization reactions were studied both in solution and melt by GPC and NMR. Solution copolymerization reactions can only form polysulfanes with up to three to four sulfur linkages; however, melt copolymerization reactions gave polysulfanes with up to seven sulfur linkages (average). The melt copolymerization reactions between cyclic disulfide oligomers derived from 4,4 -thiobis(benzenethiol) and S 8 were studied using DSC, TGA, and DMTA. With increasing contents of sulfur in the polysulfanes, T g s, 5% weight losses by TGA, and tan d decreased. With seven sulfur linkages in the polymer, it is a rubber with a T g of 12ЊC, a 5% weight loss by TGA of 249ЊC, and tan d of 44ЊC, respectively.

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