文献类型：期刊文献

英文题名：Controlled/living polymerization of MMA promoted by heterogeneous initiation system (EPN-X-CuX-bpy)

作者：Wang, XS; Luo, N; Ying, SK

机构：[1]E China Univ Sci & Technol, Lab Living Polymerizat, Shanghai 200237, Peoples R China

年份：1999

卷号：37

期号：9

起止页码：1255

外文期刊名：JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000079647500005)】；

语种：英文

外文关键词：controlled living polymerization; copper complex; methyl methacrylate; ethyl acetate; acetonitrile

摘要：The polymerization of methyl methacrylate (MMA) promoted by heterogeneous initiation system (ethyl-2-halopropionate (EPN-X)-CuX-2,2'-bipyridyl (bpy), where X = Br or Cl) is studied in detail. The results show that ethyl-2-bromopropionate (EPN-Br) is an efficient initiator as expected, and that CuCl-bpy, instead of CuBr-bpy, is a better catalyst for the controlled polymerization of MMA. The solvents with a high value of dielectric constant (epsilon) will lead to fast initiation and narrow molecular weight distribution (MWD). As a result, the controlled, living polymerization of MMA with EPN-Br-CuCl-bpy can be got in ethyl acetate (EAc) at 100 degrees C and in acetonitrile at 80 degrees C. All results suggest that the initiation reaction is a controlling step in the controlled polymerization of MMA. The relationship between the UV spectra of CuCl-bpy and the performances of the polymerization in EAc or acetonitrile suggest that the formation of bis-bpy complex, [Cubpy(2)]X-, will lead to fast initiation and good control of the polymerization, (C) 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 1255-1263, 1999.