文献类型：期刊文献

英文题名：Influence of CuBr2 on atom transfer radical polymerization in the presence of Al(OPri)3

作者：Guo, JH; Wu, PP; Han, ZW

机构：[1]E China Univ Chem Technol, Dept Polymer Sci & Engn, Shanghai 200237, Peoples R China

年份：1999

卷号：20

期号：8

起止页码：1303

外文期刊名：CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE

收录：;EI(收录号：2004057927095);WOS:【SCI-EXPANDED(收录号:WOS:000082126800030)】；

语种：英文

外文关键词：atom transfer radical polymerization; "living" radical polymerization; controlled radical polymerization; methyl methacrylates; CuBr2

摘要：Atom transfer radical polymerization of methyl methacrylates(MMA) has been achieved with ethyl-2-bromoisobutyrate [(CH3)(2)CBrCO2C2H5] as an initiator and CuBr, 2,2'-bipyridine(bPy) and aluminum triisopropoxide [Al(OPri)(3)] as an ternary catalyzing system in cyclohexanone at 40 degrees C. 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 detail in 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 (M-w/M-n = 1.94), The polymerization of MMA became slower and more controlled with CuBr2 than without CuBr2, The produced PMMA had low polydispersities (M-w/M-n = 1.2 similar to 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.