Title: | Metallocene-catalyzed ethene polymerization : long-chain branched polyethene |
Author(s): | Kokko, Esa |
Date: | 2002-09-06 |
Language: | en |
Pages: | 52, [98] |
Department: | Department of Chemical Technology Kemian tekniikan osasto |
ISBN: | 951-22-6080-8 |
Series: | Acta polytechnica Scandinavica. Ch, Chemical technology series, 290 |
ISSN: | 1239-0518 |
Subject: | Chemistry |
Keywords: | metallocene catalysts, polyethylene, copolymerization, characterization, long-chain branching, rheology |
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Abstract:Long-chain branches and narrow molecular weight distribution is a novel structure combination in polyethene, which has only been possible to achieve with single-center catalysis. Long-chain branches, even at very low concentrations, have a strong effect on the polymer melt behavior and, thereby, the processing properties. This work deals with ethene polymerization using group IV metallocene catalysts and the examination of long-chain branching in polyethene.
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Parts:Malmberg, A., Kokko, E., Lehmus, P., Löfgren, B., Seppälä, J.V., Long-Chain Branched Polyethene Polymerized by Metallocene Catalysts Et[Ind]<sub>2</sub>ZrCl<sub>2</sub>/MAO and Et[IndH4]<sub>2</sub>ZrCl<sub>2</sub>/MAO, Macromolecules 31 (1998) 8448-8454.Lehmus, P., Kokko, E., Härkki, O., Leino, R., Luttikhedde, H.J.G., Näsman, J.H., Seppälä, J.V., Homo- and Copolymerization of Ethylene and alpha-Olefins over 1- and 2-Siloxy-Substituted Ethylenebis(indenyl)zirconium and Ethylenebis(tetrahydroindenyl)-zirconium Dichlorides, Macromolecules 32 (1999) 3547-3552.Kokko, E., Malmberg, A., Lehmus, P., Löfgren, B., Seppälä, J. Influence of the Catalyst and Polymerization Conditions on the Long-Chain Branching of Metallocene-Catalyzed Polyethenes, J. Polym. Sci. Part A: Polym. Chem. 38 (2000) 376-388.Kokko, E., Lehmus, P., Leino, R., Luttikhedde, H.J.G., Ekholm, P., Näsman, J.H., Seppälä, J.V., meso- and rac-Diastereomers of 1- and 2-tert-Butyldimethylsiloxy Substituted Ethylenebis(indenyl)zirconium Dichlorides for Formation of Short- and Long-Chain Branched Polyethene, Macromolecules 33 (2000) 9200-9204.Kokko, E., Lehmus, P., Malmberg, A., Löfgren, B., Seppälä, J., Long-Chain Branched Polyethene via Metallocene-Catalysis: Comparison of Catalysts. In Organometallic Catalyst and Olefin Polymerization, Catalysts for a New Millennium, Blom, R., Follestad, A., Rytter, E., Tilset, M., Ystenes, M (Eds.) Springer, 2001, 335-345.Kokko, E., Pietikäinen, P., Koivunen, J., Seppälä, J.V., Long-Chain-Branched Polyethene by the Copolymerization of Ethene and Nonconjugated α,ω-Dienes. J. Polym. Sci. Part A: Polym. Chem. 39 (2001) 3805-3817.Kokko, E., Wang, W.-J., Zhu, S., Seppälä, J.V., Structural Analysis of Polyethene Prepared with rac-Dimethylsilylbis(indenyl)zirconium Dichloride/Methylaluminoxane in High-Temperature Continuous Stirred-Tank Reactor, J. Polym. Sci. Part A: Polym. Chem. 40 (2002) 3292-3301.Gabriel, C., Kokko, E., Löfgren, B., Seppälä, J.V., Münstedt, H., Analytical and Rheological Characterization of Long-Chain Branched Metallocene-Catalyzed Ethylene-Homopolymers, Polymer 43 (2002), in press. |
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