A kind of novel nonmetallocene catalysts for ethylene polymerization |
| |
| Authors: | Lifu Ma Yaping Sheng Qigu Huang Yangfeng Zhao Kunxue Deng Junlong Li Wantai Yang |
| |
| Institution: | State Key Laboratory of Chemical Resource Engineering, The College of Material Science and Technology, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China |
| |
| Abstract: | A kind of novel bridged nonmetallocene catalysts was synthesized by the treatment of N,N‐imidazole and N,N‐phenylimidazole with n‐BuLi, and MCl4 (M = Ti, Zr) in THF. Those catalysts were performed for ethylene polymerization after activated by methylaluminoxane (MAO). The effects of polymerization temperature, Al/M ratio, pressure of monomer, and concentration of catalysts on ethylene polymerization behaviors were investigated in detail. Those results revealed that the catalyst system was favorable for ethylene polymerization with high catalytic activity. The polymer was characterized by 13C NMR, WAXD, GPC, and DSC. The result confirmed that the obtained polyethylene featured broad molecular weight distribution around 20, linear structure, and relative low melting temperature. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 33–37, 2008 |
| |
| Keywords: | broad weight distribution metallocene catalysts methylaluminoxane nonmetallocene polyethylene structure |
|
|
