Ethylene polymerization using an asymmetric dinuclear titanocene catalyst carrying a novel 3-oxa-pentamethylene bridge |
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| Affiliation: | 1. Department of Chemical Engineering, College of Material and Chemical Engineering, Zhejiang University, Hangzhou 310027, China;2. Lanzhou Petrochemical Research Institute of Petrochina, Lanzhou 730060, China;1. College of Physics & Electronic Engineering, Changshu Institute of Technology, Changshu 215500, PR China;2. Department of Physics, Harbin Institute of Technology, Harbin 150001, PR China;3. State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing 210093, PR China;4. School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, PR China;1. Istituto per lo Studio delle Macromolecole, Consiglio Nazionale delle Ricerche, (ISMAC-CNR) Via E. Bassini, 15, Milano 20133, Italy;2. Politecnico di Milano, Dipartimenti di Chimica Industriale e Ingegneria Chimica, Via Mancinelli 7, Milano 20131, Italy;3. Università degli Studi di Milano-Bicocca, Piazza dell’Ateneo Nuovo 1, 20126 Milano, Italy;1. Department of Polymer Materials and Engineering, College of Materials Science and Engineering, Harbin University of Science and Technology, 4 Linyuan Road, Harbin 150040, PR China;2. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, PR China;1. Department of Molecular Biology and Genetics, Faculty of Science, Bart?n University, 74100 Bart?n, Turkey;2. Department of Chemistry, Faculty of Science, Gazi University, 06500 Ankara, Turkey;3. Department of Chemistry, Faculty of Science and Letters, Istanbul Technical University, 34469, Istanbul, Turkey;1. Technische Universität München, Physik-Department, Fachgebiet Physik weicher Materie, James-Franck-Str. 1, 85748 Garching, Germany;2. Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany;3. Cornell High Energy Synchrotron Source (CHESS), Wilson Laboratory, Cornell University, Ithaca, NY 14853, USA;4. IMFUFA, Department of Science, Roskilde University, P.O. Box 260,4000 Roskilde, Denmark |
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| Abstract: | The asymmetric 3-oxa-pentamethylene bridged dinuclear titanocenium complex (CpTiCl2)2 (η5-C9H6(CH2CH2 OCH2CH2)-η5-C5H3 CH3) (1) has been prepared, characterized by 1H NMR spectroscopy and elemental analysis, and after activation with MAO tested as a homogenous catalyst for the polymerization of ethylene. The results show that the catalytic activity of 1 as well as the molecular weight of the produced polyethylene are higher than those using the alkylidene bridged asymmetric dinuclear metallocenes (CpTiCl2)2 (η5-C9H6(CH2) n-η5-C5H4), n = 3 (4), 4 (5). The molecular weight distribution of polyethylene produced with 1/MAO reaches 11.00 and the HT-GPC curve shows a bimodal distribution. The melting point of the polyethylene obtained by 1/MAO is higher than 135 °C and the 13C NMR spectrum of PE shows only one strong signal at 30 ppm for the methylene units indicating a highly linear and crystalline polymer. |
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