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Citation: ZHANG Qi-Xing, FAN Xin-Gang, HU Ming-Peng, WANG Hai-Hua. Preparation of Long-Branching Chain Polyethylene Using Double Transition Metal TiCl₄-Co(acac)₂ Combined Catalyst[J]. Chinese Journal of Applied Chemistry, ;2003, 20(9): 888-892. shu

Preparation of Long-Branching Chain Polyethylene Using Double Transition Metal TiCl₄-Co(acac)₂ Combined Catalyst

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

Corresponding author: ZHANG Qi-Xing,
Received Date: 19 December 2002
Available Online: 31 March 2003
Fund Project: 广东省自然科学基金资助项目(001280) (001280)

The novel catalysts of TiCl₄-acac-Co(acac)₂, TiCl₄-Co(acac)₂ and TiCl₄-acac supported on SiO₂-MgCl₂ carrier(Ti-Co combined catalyst) were prepared. They catalyze polymerimerization of ethylene giving branched polyethylene when Et₂AlCl was used as a cocatalyst. The polymerization products have low melting point, low crystallinity and high degree of branching as evaluated by FTIR, DSC and ¹³C NMR spectrum. The results of ¹³C NMR suggested more than 55.0% of the polyethylene contain long branch chain(n≥6). Experimental results showed that the Ti-Co combined catalyst exhibites an excellent catalytic property for oligomerization and in situ copolymerization of ethylene.
- Ti-Co combined catalyst,
- ethylene polymerization,
- branched polyethylene,
- copolymerization in situ
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Preparation of Long-Branching Chain Polyethylene Using Double Transition Metal TiCl₄-Co(acac)₂ Combined Catalyst