Thermostable α-Diimine Nickel Complexes with Substituents on Acenaphthequinone-backbone for Ethylene Polymerization  

作　　者：Rui-Fang Zhang Yan-Hui Hou Xu-Ling Wei Ding-Ding Zhao Mi-Mi Cui Fei-Fan Zhai Xiang-Liu Li Bin-Yuan Liu Min Yang 

机构地区：[1]Hebei Key Laboratory of Functional Polymers,Tianjin Key Laboratory of Chemical Process Safety,Institute of Polymer Science and Engineering,Hebei University of Technology,Tianjin 300130,China [2]State Key Laboratory of Separation Membranes and Membrane Processes,School of Material Science and Engineering,Tiangong University,Tianjin 300160,China [3]Lanzhou Petrochemical Research Center,Petrochemical Research Institute of CNPC,Lanzhou 730060,China

出　　处：《Chinese Journal of Polymer Science》2020年第11期1214-1220,I0007,共8页高分子科学（英文版）

基　　金：the National Natural Science Foundation of China(Nos.21004017 and 21004043);the Natural Science Foundation of Hebei Provinee(No.B2015202049).

摘　　要：In order to promote the thermostability of a-diimine nickel complex by ligand backbone structure,a series of α-diimine nickel complexes with substituents on acenaphthequinone backbone were synthesized and used as catalysts for ethylene polymerization.When the hydroxyethyl phenoxyl group was introduced to the acenaphthequinone-backbone,the thermal stability and activity of the catalyst could be significantly improved.The catalytic activity of complex C2[5-(4-(2-hydroxyethyl)phenoxyl)-N,N-bis(2,6-diisopropyl)acenaphthylene-1,2-diimine]nickel(Ⅱ)dibromide with isopropyl substituents on N-aryl reached 8.2×10^6g/(molNi·h)at 70℃and 2 MPa.The activity of[5-(4-(2-hydroxyethyl)phenoxyl)-N,N-bis(2,6-dibenzhydryl-4-menthylphenyl)acenaphthylene-1,2-diimine]nickel(Ⅱ)dibromide(C3)still maintained at 6.7×10^5 g/(molNi·h)at 120℃.Compared with C3 containing bulky dibenzhydryl substituents,the activity of C2 was sensitive to the change of the polymerization pressure.However,the polyethylenes obtained from complex C3 had lower branching density.Meanwhile,the molecular weight could reach 971 kg/mol,which is almost 5 times as much as that of the polyethylene obtained from complex C2.

关 键 词：α-Diimine nickel Ethylene polymerization Thermostability Ligand backbone structure 

分 类 号：TQ426[化学工程] TQ325.12