Efficient ethylene/norbornene copolymerization by half‐titanocenes containing imidazolin‐2‐iminato ligands and MAO catalyst systems |
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| Authors: | Wannida Apisuk Alexandra G. Trambitas Boonyarach Kitiyanan Matthias Tamm Kotohiro Nomura |
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| Affiliation: | 1. Department of Chemistry, Tokyo Metropolitan University, , Hachioji, Tokyo, 192–0397 Japan;2. The Petroleum and Petrochemical College, Chulalongkorn University, , Bangkok, 10330 Thailand;3. Institut für Anorganische und Analytische Chemie, Technische Universit?t Carolo‐Wilhelmina zu Braunschweig, , 38106 Braunschweig, Germany |
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| Abstract: | Ethylene copolymerizations with norbornene (NBE) using half‐titanocenes containing imidazolin‐2‐iminato ligands, Cp′TiCl2[1,3‐R2(CHN)2C?N] [Cp′ = Cp ( 1 ), tBuC5H4 ( 2 ); R = tBu ( a ), 2,6‐iPr2C6H3 ( b )], have been explored in the presence of methylaluminoxane (MAO) cocatalyst. Complex 1a exhibited remarkable catalytic activity with better NBE incorporation, affording high‐molecular‐weight copolymers with uniform molecular weight distributions, whereas the tert‐BuC5H4 analog ( 2a ) showed low activity, and the resultant polymer prepared by the Cp‐2,6‐diisopropylphenyl analog ( 1b ) possessed broad molecular weight distribution. The microstructure analysis of the poly(ethylene‐co‐NBE)s prepared by 1a suggests the formation of random copolymers including two and three NBE repeating units. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 2575–2580 |
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| Keywords: | catalysis copolymerization ethylene half‐titanocene metal‐organic catalysts/organometallic catalysts norbornene polyolefins titanium |
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