高等学校化学学报

高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (8): 1303.

• 论文 • 上一篇    下一篇

溴化铜对异丙醇铝存在下原子转移自由基聚合的影响

郭建华, 吴平平, 韩哲文   

  1. 华东理工大学高分子科学与工程系, 上海 200237
  • 收稿日期:1998-08-31 出版日期:1999-08-24 发布日期:1999-08-24
  • 通讯作者: 吴平平
  • 作者简介:郭建华,女,29岁,博士研究生.

Influence of CuBr2 on Atom Transfer Radical Polymerization in the Presence of Al(OPri)3

GUO Jian-Hua, WU Ping-Ping, HAN Zhe-Wen   

  1. Department of Polymer Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
  • Received:1998-08-31 Online:1999-08-24 Published:1999-08-24

PDF (PC)

被引次数

24

摘要： 研究了以2-溴异丁酸乙酯为引发剂、溴化亚铜(CuX)/联二吡啶(bPy)/异丙醇铝[Al(OPri)3]为三元复合催化体系,40℃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CuBr2浓度的提高,自由基浓度降低,终止反应受到抑制;不加CuBr2时,聚合物的分子量分布较宽(Mw/Mn);加入CuBr2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.

关键词: 原子转移自由基聚合, &ldquo, 活性&rdquo, 自由基聚合, 受控聚合, 溴化铜, 甲基丙烯酸甲酯

Abstract: Atom transfer radical polymerization of methyl methacrylates(MMA) has been achieved with ethyl-2-bromoisobutyrate[(CH3)2CBrCO2C2H5] as an initiator and CuBr, 2,2′-bipyridine(bPy) and aluminum triisopropoxide [Al(OPri)3] as an ternary catalyzing system in cyclohexanone at 40 ℃. MMA can be polymerized in a living fashion at low temperature with Al(OPri)3 as a catalytic promoter. The influence of CuBr2 on the ATRP of MMA was discussed in detaiLIN this paper. The radical concentration reduced with the addition of CuBr2, so bimolecular termination was suppressed. Without the addition of CuBr2, the produced polymers had high polydispersities(Mw/Mn=1.94). The polymerization of MMA became slower and more controlled with CuBr2 than without CuBr2. The produced PMMA had low polydispersities(Mw/Mn=1.2-1.5) and controlled molecular weights which were nearly proportional to monomer conversion. The logarithmic conversion data plotted against time (ln([M]0/[M])vs. t) displayed current first order kinetics in monomer.

Key words: Atom transfer radical polymerization, “Living&rdquo, radical polymerization, Con-trolled radical polymerization, Methyl methacrylates, CuBr2

中图分类号: 

TrendMD: