Synthesis of a new zirconium catalyst for ethylene polymerization |
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| Authors: | Fabiana De C Fim Tiago Machado Denise Santos De Sá Paolo R Livotto Zênis N Da Rocha Nara R De S Basso Griselda Barrera Galland |
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| Institution: | 1. Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gon?alves 9500, 91501‐970 Porto Alegre, Brazil;2. Faculdade de Química, Pontifícia Universidade Católica do Rio Grande do Sul, Av. Ipiranga 6681, 90619‐900 Porto Alegre, Brazil;3. Instituto de Química, Universidade Federal da Bahia, Campus de Ondina, 40170‐290 Salvador, Brazil |
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| Abstract: | A novel complex dichlorobis(2‐ethyl‐3‐hydroxy‐4‐pyrone)zirconium(IV) (ZrCl2(ethylpyrone)2) was synthesized. Complexation of the pyrone ligand to the zirconium was confirmed by UV, 1H and 13C‐NMR, and electrochemical studies. NMR showed the presence of four isomers and density functional theory calculations indicated that the main isomer had a cis configuration. The catalyst was shown to be active in ethylene polymerization in the presence of the cocatalyst methylaluminoxane. The highest catalyst activity for the zirconium complex was achieved at Al/Zr = 2500, 70 °C and when a small concentration of catalyst was used (1 μmol). © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 3830–3841, 2008 |
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| Keywords: | catalysis NMR polyethylene (PE) synthesis UV‐vis spectroscopy |
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