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研究了以 2 -溴异丁酸乙酯为引发剂、溴化亚铜 (Cu X) /联二吡啶 (b Py) /异丙醇铝[Al(OPri) 3]为三元复合催化体系 ,4 0℃下甲基丙烯酸甲酯 (MMA)在环己酮中的原子转移自由基聚合 ,详细研究了溴化酮对聚合反应的影响 .实验结果表明 ,以异丙醇铝为助催化剂 ,MMA可在较低温度下进行活性聚合 ;随着 Cu Br2 浓度的提高 ,自由基浓度降低 ,终止反应受到抑制 ;不加 Cu Br2 时 ,聚合物的分子量分布较宽 (Mw/ Mn) ;加入 Cu Br2 时 ,聚合物的分子量分布较窄(Mw/ Mn=1 .2～ 1 .5) ,而且对数转化率与时间呈线性关系 .
The catalytic activity of Cu (superscript b) / bpy / Al (OPri) 3 was investigated by using 2 - bromoisobutyrate as initiator, Atomization of methyl methacrylate (MMA) in cyclohexanone at 40 ℃ was investigated by means of atom transfer radical polymerization. The effects of brominated ketone on the polymerization were investigated in detail. The experimental results show that with aluminum isopropoxide as catalyst, MMA With the increase of Cu Br2 concentration, the concentration of free radicals decreased and the termination reaction was inhibited. The molecular weight distribution of polymer was broad (Mw / Mn) without Cu Br2 addition. The addition of Cu Br2 , The molecular weight distribution of the polymer is narrow (Mw / Mn = 1.2-1.5), and the logarithmic conversion rate is linear with time.