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Citation: XUE Xing-Hua, WANG Hai-Hua, HU Yang-Jian. Structure and Property of Branched Polyethylenes Obtained over Supported Catalysts of Nickel Diimine Complex[J]. Chinese Journal of Applied Chemistry, ;2005, 22(1): 45-49. shu

Structure and Property of Branched Polyethylenes Obtained over Supported Catalysts of Nickel Diimine Complex

1.
Institute of Polymer Science, School of Chemistry and Chemical Engineering, Zhongshan University, Guangzhou 510275

Corresponding author: WANG Hai-Hua,
Received Date: 29 February 2004
Available Online: 8 June 2004
Fund Project: 广东省自然科学基金资助项目(031598) (031598)

Supported catalysts for ethylene polymerization were prepared by the interaction of nickel diimine complex (C₆H₅-N=C(CH₃)C(CH₃)=N-C₆H₅)NiCl₂ with MgCl₂(THF)₂, silica and their bisupport,and branched polyethylenes were obtained with AlEt₂Cl as cocatalyst. Supports and polymerization temperature have pronounced effects on catalytic activity of the catalysts and the properties of polyethylene products. The highest catalytic activity of 2.5×10⁵ g/(mol·h) was obtained at 14℃ over MgCl₂/SiO₂ bisupport, and the branching degree of polyethylene product was 1.7%. ¹³C NMR analysis reveals there are methyl, butyl and long branches at polyethylene backbone. Branching degree of the polyethylenes and the content of methyl branch rise quickly with reaction temperature, but the content of long branches drops remarkably. Particle size analysis reveals that the size of polymer microspheres presents a Gaussian distribution.
- nickel diimine complex,
- supported catalyst,
- branched polyethylene
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