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首页> 外文期刊>Polymers for advanced technologies >Silica-immobilized cumyl dithiobenzoate as mediating agent in reversible addition fragmentation chain transfer (RAFT) polymerization
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Silica-immobilized cumyl dithiobenzoate as mediating agent in reversible addition fragmentation chain transfer (RAFT) polymerization

机译：二氧化硅固定化二硫代苯甲酸枯基酯作为可逆加成断裂链转移（RAFT）聚合反应的介导剂

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摘要

Reversible addition fragmentation chain transfer (RAFT) polymerizations of styrene and methyl methacrylate were performed in bulk at 608C, using cumyl dithiobenzoate as the mediating RAFT agent that has been immobilized via the stabilizing Z-group to nanometer-sized fumed silica particles. Increasing molecular weights with monomer conversion and absence of conventional polymerization activity in the interstitial solution phase were observed when the overall concentration of silica particles was carefully balanced with their respective cumyl dithiobenzoate loading. After completion of the polymerization, potentially sulfur-free polymers with controlled molecular weights were obtained, initially via collecting the terminated polymeric material from the interstitial solution phase and, secondly, via cleavage of the surface-confined polymer by a single addition fragmentation chain transfer step, which provides a pathway for recovery of the solid-supported RAFT agent.
机译：苯乙烯和甲基丙烯酸甲酯的可逆加成断裂链转移（RAFT）聚合反应是在608°C下进行的，使用二硫代苯甲酸枯基酯作为介导的RAFT试剂，该试剂已通过稳定的Z-基团固定在纳米级气相二氧化硅颗粒上。当二氧化硅颗粒的总体浓度与它们各自的枯基二硫代苯甲酸酯负载量仔细平衡时，观察到在单体溶液相中分子量随单体转化而增加，并且在常规溶液中不存在常规聚合活性。聚合完成后，首先通过从间隙溶液相中收集封端的聚合物材料，其次通过单次添加断裂链转移步骤裂解表面受限的聚合物，获得了具有受控分子量的潜在无硫聚合物。 ，提供了回收固载RAFT剂的途径。

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