Synthesis and Characterization of α-Diimine Nickel(Ⅱ) Catalyst Containing Br Groups for Ethylene Polymerization

Chem. J. Chinese Universities ›› 2011, Vol. 32 ›› Issue (5): 1200.

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Synthesis and Characterization of α-Diimine Nickel(Ⅱ) Catalyst Containing Br Groups for Ethylene Polymerization

YUAN Jian-Chao*, MEI Tong-Jian, WANG Xue-Hu, LIU Yu-Feng

Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education, Gansu Key Laboratory of Polymer Materials, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China

Received:2010-08-05 Revised:2010-09-30 Online:2011-05-10 Published:2011-04-11
Contact: YUAN Jian-Chao E-mail:jianchaoyuan@nwnu.edu.cn
Supported by:
国家自然科学基金(批准号: 20964003)、2009年教育部留学回国人员科研启动基金(批准号: [2009]1341)和2009年人力资源和社会保障部留学人员科技活动项目择优资助项目(批准号: 2009[416])资助.

Abstract

Abstract: A new Br-substituted alpha-diimine compound and its corresponding Ni(II) complex, {bis[N,N’-(3-bromo-2,4,6-trimethylphenyl)imino]acenaphthene}dibromonickel was successfully synthesized, and characterized by 1H NMR, 13C NMR, elemental analysis, FT-IR and XPS. The pre-catalyst 2 activated by methylaluminoxane (MAO) was tested in the polymerization of ethylene, showed to be highly active (5.50×106gPE/ (molNi.h.bar)). The catalyst system 2/MAO showed the highest activity with the 800 of Al/Ni molar ratio at 25 ?C. It was found that the catalyst containing electron-withdrawing groups Br showed better thermal stability and almost the same catalytic activity. At same time, branching degrees was increased in the presence of electron-withdrawing groups Br. The polymer were characterized by 1H NMR, 13C NMR, GPC、TG、DSC.

Key words: alpha-Diimine ligand Bromo-containing, Nickel (II) complexes, Ethylene polymerization, Branched Polyethylene

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YUAN Jian-Chao*, MEI Tong-Jian, WANG Xue-Hu, LIU Yu-Feng. Synthesis and Characterization of α-Diimine Nickel(Ⅱ) Catalyst Containing Br Groups for Ethylene Polymerization[J]. Chem. J. Chinese Universities, 2011, 32(5): 1200.

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Synthesis and Characterization of α-Diimine Nickel(Ⅱ) Catalyst Containing Br Groups for Ethylene Polymerization

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