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BRANCHING GENERATION DURING THE FREE RADICAL COpOLYMERIZATION OF p-vinyl benzene sulfonyl chloride WITH STYRENE

Chinese Journal of polymer Science 2013年第10期31卷 1404-1414页

作者： Cui-ping Li Rong Huang Jia-qiang Wang Zan Liu Department of Applied Chemistry Key Laboratory of Medicinal Chemistry for Natural Resource College of Chemistry Science and Engineering Yunnan University Kunming Cable Co. Ltd

The branching generation during the free radical copolymerization of chain transfer monomer p-vinyl benzene sulfonyl chloride （VBSC） with styrene was investigated by a simple mathematic model. Chain transfer constant of VBSC was determined to be around 0.3 by fitting the 1H-NMR monitored experimental results with a mathematic model. According to the theoretical analysis, the obtained poIy（VBSC） and its copolymers were substantiated to have a grafting-like main chain with residual pendent sulfonyl chloride groups after consuming most of the vinyl groups. The copolymerization results of VBSC with styrene at varied feed ratios demonstrated that conversion of sulfonyl chloride groups was lower than that of the monomer, which was in agreement with the theoretical results. The glass transition temperature, number average molecular weight and distribution of those obtained polymers were primarily investigated. Comparing with other chain transfer monomers, VBSC has a chain transfer constant much closer to unity therefore a more branched polymer is expected. Additionally, the branched polystyrene with residual sulfonyl chloride groups is hopefully to be further used as ATRp macro- initiators or reactive intermediates to synthesize functional polymers with complex structure.

关键词： Branched polystyrene Chain transfer constant Chain transfer monomer p-vinyl benzene sulfonyl chloride Radical polymerization.

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