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以自制的 2 ,2 ,6,6-四甲基哌啶 -1 -氧 (TEMPO)作为稳定氮氧自由基 ,研究了TEMPO的存在对过氧化二苯甲酰 (BPO)引发的苯乙烯聚合反应的影响。在此基础上 ,采用氧化 -还原引发体系和自由基捕捉反应一步合成了带有羟基和 2 ,2 ,6,6-四甲基哌啶 -1 -氧基团的新型引发剂 ;由此引发剂通过简易可行的可控自由基聚合反应制备了窄分散性的端羟基聚苯乙烯齐聚物 ,再经酯交换化反应合成了窄分散性聚苯乙烯大分子单体 ;最后以聚苯乙烯大分子单体和甲基丙烯酸甲酯进行共聚合反应制备了聚甲基丙烯酸甲酯接枝聚苯乙烯 (PMMA -g -PS)接枝共聚物。研究结果表明 :端羟基聚苯乙烯齐聚物和聚苯乙烯大分子单体的分子质量分布指数为 1 .3左右 (<1 .5) ,而且分子质量实测值与理论计算值能够很好地吻合 ,合成的聚苯乙烯大分子单体可以和甲基丙烯酸甲酯顺利进行共聚合反应合成接枝共聚物
The self-made 2,2,6-tetramethylpiperidine-1-oxide (TEMPO) was used as a stable nitroxide to study the effect of TEMPO on the polymerization of styrene initiated by dibenzoyl peroxide (BPO) The impact of the reaction. On this basis, a novel initiator with hydroxyl and 2,2,6,6-tetramethylpiperidine-1-oxy group was synthesized in one step using oxidation-reduction initiation system and radical catching reaction. Agent is prepared by a simple and feasible controlled radical polymerization of narrow dispersion of hydroxyl-terminated polystyrene oligomers, and then transesterification reaction was synthesized Narrow dispersion of polystyrene macromer; finally polystyrene Polymethyl methacrylate grafted polystyrene (PMMA-g-PS) graft copolymer was prepared by copolymerization of macromonomer and methyl methacrylate. The results show that the molecular mass distribution index of hydroxyl-terminated polystyrene oligomers and polystyrene macromonomers is about 1.3 (<1.5), and the measured molecular mass and theoretical calculated values can be well Anastomosis, the synthesis of the polystyrene macromonomer and methyl methacrylate can be successfully conducted copolymerization graft copolymer