Ethylene homo- and copolymerization using (nBuCp)2ZrCl2 grafted on silica modified with different spacers |
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| Authors: | Griselda Barrera Galland Jo o H Z dos Santos Fernanda C Stedile Paula Palmeira Greco and Adriano D Campani |
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| Institution: | Instituto de Química, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, Porto Alegre 91501-970, Brazil |
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| Abstract: | (nBuCp)2ZrCl2 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), Me3SiCl, Ph3SiOH, SnCl4, isodrin and aldrin. (nBuCp)2ZrCl2 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. |
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| Keywords: | Supported metallocenes LLDPE 1-Hexene Copolymerization Silica |
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