meso-Me₂Si(1-indenyl)₂ZrCl₂/methylalumoxane catalyzed polymerization of the ethylene to ethyl-branched polyethylene

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• 作者：Melillo ; Gianluca ; Izzo ; Lorella ; Centore ; Roberto ; Tuzi ; Angela ; Voskoboynikov ; Alexander Z. ; et. al.
• 关键词：Polyethylene ; Polymerization ; Metallocenes
• 刊名：Journal of Molecular Catalysis. A ; Chemical
• 出版年：2005
• 期刊代码：57_13811169
• 类别：ch
• 出版时间：April 6, 2005
• 卷：230
• 期：1-2
• 页码：29-33
• 文件大小：101 K

摘要

The meso ansa zirconocene with dimethylsilyl bridge, activated by methylalumoxane, catalyses the ethylene polymerization, producing ethyl-branched polyethylene. With respect to the polymers obtained with the previously investigated meso zirconocenes, we have found higher branching amount and lower molecular weight. The rapid β-H transfer from the growing chain to the coordinated monomer could account for both these features of the polymer. The investigation on the structural parameters of the complex, through X-ray diffraction analysis, and on the electrophilicity of the cationic center, through NMR experiments, suggests, as a possible rationalization of this behavior, the obstruction in the inward site.