Branched polystyrene with abundant pendant vinyl functional groups from asymmetric divinyl monomer
Branched polystyrene with abundant pendant vinyl functional groups from asymmetric divinyl monomer
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具有丰富的来自不对称二乙烯基单体的侧挂乙烯基官能团的支化聚苯乙烯
DOI：
10.1002/pola.22913
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发表时间：
2008-09-15
影响因子：
--
通讯作者：
Li, Yue-Sheng
中科院分区：
文献类型：
--
作者：
Dong, Zhong-Min;Liu, Xiao-Hui;Li, Yue-Sheng
不对称二乙烯基单体具有较高活性的苯乙烯基和较低的活性丁烯基，通过自由基聚合法合成了富含侧链乙烯基团的支化聚苯乙烯。采用快速可逆加成断裂链转移(RAFT)平衡，活性增殖链的浓度保持在较低的值，因此直到单体转化率较高时才发生交联。较高的反应温度(120℃)和RAFT试剂异丙基二硫代苯甲酸酯的组合被证明是提供更高支化结构和更高聚合物产率的最佳组合。
Branched polystyrenes with abundant pendant vinyl functional groups were prepared via radical polymerization of an asymmetric divinyl monomer, which possesses a higher reactive styryl and a lower reactive butenyl. Employing a fast reversible addition fragmentation chain transfer (RAFT) equilibrium, the concentration of active propagation chains remained at a low value and thus crosslinking did not occur until a high level of monomer conversion. The combination of a higher reaction temperature (120 degrees C) and RAFT agent cumyl dithiobenzoate was demonstrated to be optimal for providing both a more highly branched architecture and a higher polymer yield.