能源化学(英文版)

能源化学(英文) ›› 2004, Vol. 13 ›› Issue (4): 218-224.

• Articles • 上一篇    下一篇

Ethylene Polymerization Catalyzed by Monocyclopentadienyl Titanium Complex Containing 8-Quinolinolato

Jianjun Yi, Xiaoguang Zhao, Han Zhou, Zhenhua Jing   

  1. Polymer Department, Research Institute of Petroleum Processing, Beijing 100083, China
  • 出版日期:2004-12-30 发布日期:2004-12-30

Ethylene Polymerization Catalyzed by Monocyclopentadienyl Titanium Complex Containing 8-Quinolinolato

Jianjun Yi, Xiaoguang Zhao, Han Zhou, Zhenhua Jing   

  • Online:2004-12-30 Published:2004-12-30

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摘要： A monocyclopentadienyl titanium complex containing 8-quinolinolato (QCpTiCl2) was synthesized. Its activities in ethylene polymerization at various Al/Ti molar ratios, different temperatures and activation time were investigated. The activity with a Al/Ti molar ratio of 500 exhibited a maximum of 2.8×105 g/(mol·h) at 30℃ . The activation time of QCpTiCl2 with MAO before polymerization also plays a role on the activity. The structural properties of the produced polyethylene (molecular weight, molecular weight distribution and melting point) were discussed. Kinetic behaviors of ethylene polymerization with the QCpTiCl2/MAO system at different Al/Ti molar ratios were studied. For the QCpTiMeCl/MAO system and the CpTiMe2Cl/MAO system, binding energies of the examined intermediates were calculated by quantum-mechanical method based on ADF program, respectively. It is confirmed that the chlorinebridged adduct formed by the reaction of QCpTiMeCl with MAO is thermodynamically steady. In the case of the QCpTiMeCl/MAO system, olefin-separated ion pair (OSIP) mechanism is much favorable than ion-pair dissociation (IPD) mechanism. The evidence that the CpTiMe2Cl/MAO system is unfavorable to form active species with ethylene supports the experimental result that the CpTiMe2Cl/MAO system showed lower activity for ethylene polymerization than the QCpTiMeCl/MAO system.

关键词: 8-quinolinolato, monocyclopentadienyl, titanium complexes, ethylene polymerization, catalyst,

Abstract: A monocyclopentadienyl titanium complex containing 8-quinolinolato (QCpTiCl2) was synthesized. Its activities in ethylene polymerization at various Al/Ti molar ratios, different temperatures and activation time were investigated. The activity with a Al/Ti molar ratio of 500 exhibited a maximum of 2.8×105 g/(mol·h) at 30℃ . The activation time of QCpTiCl2 with MAO before polymerization also plays a role on the activity. The structural properties of the produced polyethylene (molecular weight, molecular weight distribution and melting point) were discussed. Kinetic behaviors of ethylene polymerization with the QCpTiCl2/MAO system at different Al/Ti molar ratios were studied. For the QCpTiMeCl/MAO system and the CpTiMe2Cl/MAO system, binding energies of the examined intermediates were calculated by quantum-mechanical method based on ADF program, respectively. It is confirmed that the chlorinebridged adduct formed by the reaction of QCpTiMeCl with MAO is thermodynamically steady. In the case of the QCpTiMeCl/MAO system, olefin-separated ion pair (OSIP) mechanism is much favorable than ion-pair dissociation (IPD) mechanism. The evidence that the CpTiMe2Cl/MAO system is unfavorable to form active species with ethylene supports the experimental result that the CpTiMe2Cl/MAO system showed lower activity for ethylene polymerization than the QCpTiMeCl/MAO system.

Key words: 8-quinolinolato, monocyclopentadienyl, titanium complexes, ethylene polymerization, catalyst,