二苯甲酮封端制备大分子自由基引发剂及引发甲基丙烯酸甲酯聚合研究  

Synthesis of a macroinitiator with a benzophenone terminus and a study of the induced polymerization of methyl methacrylate

作　　者：余金光[1] 韩丙勇[1] 鲁建民[1] 杨万泰[1] 

机构地区：[1]北京化工大学化工资源有效利用国家重点实验室,北京100029

出　　处：《北京化工大学学报（自然科学版）》2012年第2期37-40,共4页Journal of Beijing University of Chemical Technology(Natural Science Edition)

摘　　要：采用阴离子聚合的方法,以二苯甲酮为封端剂,合成了聚丁二烯大分子自由基引发剂;利用核磁共振仪对聚丁二烯大分子引发剂的结构进行了表征,并根据核磁共振氢谱中苯环特征峰面积计算封端效率。结果表明,低温有利于封端反应,30℃下封端效率为38.3%。进一步,利用聚丁二烯大分子引发剂引发甲基丙烯酸甲酯(MMA)自由基聚合,制备了聚丁二烯-聚甲基丙烯酸甲酯嵌段共聚物,考察了反应温度和反应时间对PB-PMMA嵌段共聚的影响。结果表明,85℃下反应5 h共聚物产率相对较高,分布较窄。A polybutadiene （PB） macroinitiator end-capped with benzophenone was synthesized via anionic polymerization using n-BuLl as initiator. Its structure was characterized by 1H-NMR spectroscopy. The end-capping reaction was carried out at different temperatures and the results indicated that the end-capping efficiency decreased as the temperature was increased. The reaction at 30 ℃ exhibited an end-capping efficiency of 38.3%. 1H-NMR spectroscopy and gel permeation chromatography （GPC） showed that a butadiene-poly（methyl methacrylate） block copolymer （PB-block-PMMA） could be prepared using the PB macroinitiator. The effects of different reaction conditions on the co-polymerization of PB-PMMA were studied. The results showed that the optimum reaction conditions involved a reaction temperature of 85 ℃ and a reaction time of 5 h.

关 键 词：阴离子聚合 二苯甲酮 封端剂 大分子自由基引发剂 甲基丙烯酸甲酯 嵌段共聚物 

分 类 号：O632.14[理学—高分子化学]