Ethylene homo- and copolymerization using (nBuCp)b>2b>ZrClb>2b> grafted on silica modified with different spacers

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• 作者：Galland ; Griselda Barrera ; dos Santos ; Joã ; o H.Z. ; Stedile ; Fernanda C. ; Greco ; Paula Palmeira ; et. al.
• 关键词：Supported metallocenes ; LLDPE ; 1-Hexene ; Copolymerization ; Silica
• 刊名：Journal of Molecular Catalysis A: Chemical
• 出版年：2004
• 出版时间：March 1, 2004
• 年：2004
• 卷：210
• 期：1-2
• 页码：149-156
• 全文大小：192 K

文摘

(nBuCp)b>2b>ZrClb>2b> was grafted on a series of modified silica and evaluated in ethylene/1-hexene copolymerization and their performance was compared with the homogenous system and with that resulting from its immobilization on bare silica. Silica was modified by polymethylhydrosiloxane (PMHS), Meb>3b>SiCl, Phb>3b>SiOH, SnClb>4b>, isodrin and aldrin. (nBuCp)b>2b>ZrClb>2b> grafted on PMHS-modified silica afforded the catalyst with the highest activity. Comonomer incorporation, melting point and polydispersity was shown to be dependent on the catalyst nature. Bimodality was observed in the case of ethylene homopolymerization employing PMHS-silica-based catalysts.