Ansa-metallocene complexes (III) - synthesis and application in ethylene polymerization of sila-bridged bis(indenyl and tetrahydroindenyl) titanium and zirconium complexes

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作者
Wang, Bai-Quan
Xu, Shan-Sheng
Zhou, Xiu-Zhong
Su, Li-Ming
Feng, Ru
He, Da-Wei
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Kao Teng Hsueh Hsiao Hua Heush Hsueh Pao/ Chemical Journal of Chinese Universities | 1999年 / 20卷 / 01期
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摘要
Tetramethyldisilane-bridged bis(1-indenyl and tetrahydroindenyl) metallocene dichlorides(Me2SiSiMe2)Ind2MCl2[M = Ti (1), Zr (2)] and (Me2SiSiMe2)[IndH4]2MCl2[M = Ti (3), Zr(4)] were synthesized. Complexes 1-4 were characterized by 1H NMR, mass spectra and elemental analyses. Complexes 3 and 4 were used for the polymerization of ethylene after activation with methyl aluminoxane(MAO) at different temperatures and normal pressure. The titanocene 3 shows a lower activity but produces polyethylene with a higher molecular weight than zirconocene 4. The catalyst systems show a dependency of the activity and molecular weight on temperature.
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页码:77 / 80
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