文献类型：期刊文献

英文题名：Studies on the tacticity of poly(methyl methacrylate) synthesized by atom transfer radical polymerization

作者：Qian, J; Guo, JH; Han, ZW; Wu, PP

机构：[1]E China Univ Sci & Technol, Inst Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2000

卷号：21

期号：11

起止页码：1762

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

收录：;EI(收录号：2000125422867);WOS:【SCI-EXPANDED(收录号:WOS:000165386600037)】；

语种：英文

外文关键词：atom transfer radical polymerization; tacticity; poly(methyl methacrylate); C-13 NMR

摘要：Two series of PMMA samples have been synthesized by Atom Transfer Radical Polymerization (ATRP) with and without catalytic promoter(aluminum isopropoxide, (i-PrO)(3)Al in the temperature range of 0 similar to 100 degreesC. Their tacticity has teen determined by C-13 Nuclear Magnetic Resonance(NMR). The results showed that the polymers by ATRP were all predominantly syndiotactic, and the tendency to form syndiotactic sequences decreased with the polymerization temperature increase, The tacticity of PMMA was influenced by catalytic promoter, [(i-PrO)(3)Al], because it coordinates with the ester carbonyl group of polymer chain end, The activation parameters governing the tacticity of ATRP were calculated, The results indicate that the same type of active species is present in ATRP and conventional radical system.