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.
出处
《北京化工大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第2期37-40,共4页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
