文献类型：期刊文献

英文题名：Copolymerization of Ethylene and Methyl Methacrylate with Salicylaldiminate Nickel (II) Complexes

作者：Zhang Danfeng[1];Zhang Yujun[1];Yu Guocong[1];Gao Wenhao[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Shanghai 200237, Peoples R China

年份：2017

卷号：38

期号：11

起止页码：2082

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

收录：;EI(收录号：20180504685139);WOS:【SCI-EXPANDED(收录号:WOS:000414964600024)】；

基金：Supported by the Shanghai Municipal Key Disciplines and Key Laboratory Project, China(No. B502).

语种：英文

外文关键词：Salicylaldiminate-based nickel (II) complex; Polyolefin; Copolymerization of ethylene and methyl methacrylate; Catalytic activity

摘要：Four salicylaldiminate. based nickel (II) complexes: bis [N-(2,6-diisopropylphenyl) salicylaldi-minate]-nickel (II) (C1), bis [N-(2,6-diisopropylphenyl)-3-methylsalicylaldiminate]-nickel (II) (C2), bis [N-(2,6-diisopropylphenyl)-3-isopropylsalicylaldiminate]-nickel (II) (C3) and [N-(2,6-diisopropyl-phenyl)-3-isopropylsalicylaldiminate]-nickel (Ph) (PPh3) (C4), in the presence of methylaluminoxane (MAO), were applied in copolymerization of ethylene and methyl methacrylate(MMA). The influences of pol-ymerization parameters, such as molar ratio of Al/Ni, polymerization temperature and time, on the copolymerization were studied with complex C3 as a model catalyst. Based on these results, the effect of the structure of the nickel complexes on the copolymerization was explored under optimized polymerization conditions. Complex C2 exhibits higher catalytic activity of 13. 1 kg/(mol Ni . h) than C1 and C3, while C3 gives the lowest comonomer MMA incorporation of 14. 1% in the obtained copolymers. For complexes C3 and C4, with the same ligand but different structures, C3 displays better catalytic activity than C4, but their comonomer MMA incorporations are similar. The microstructures and thermo. properties of the obtained copolymers were characterized by means of FTIR, H-1 NMR, C-13 NMR, GPC and DSC.