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, Xiao-Song[1]; Luo, Ning[1]; Ying, Sheng-Kang[1]

机构：[1] Laboratory of Living Polymerization, East China University of Science and Technology, Shanghai, 200237, 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：EI(收录号：1999284674957)

语种：英文

外文关键词：Acetonitrile - Bromine compounds - Catalysts - Copper compounds - Esters - Initiators (chemical) - Molecular weight distribution - Permittivity - Polymerization

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 (Ε) 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°C and in acetonitrile at 80 °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, [Cubpy2]X-, will lead to fast initiation and good control of the polymerization.