Linear low-density polyethylenes by co-polymerization of ethylene with 1-hexene in the presence of titanium precursors and organoaluminium co-catalysts

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• 作者：Carlo Carlini ; Aldo D'Alessio ; Simone Giaiacopi ; Riccardo Po ; Mariano Pracella ; Anna  ; Maria Raspolli Galletti ; Glauco Sbrana
• 关键词：Titanium(IV) bis-carboxylato precursors ; Ethylene/1-hexene copolymers ; Organoaluminium co-catalysts
• 刊名：Polymer
• 出版年：2007
• 出版时间：23 February 2007
• 年：2007
• 卷：48
• 期：5
• 页码：1185-1192
• 全文大小：519 K

文摘

The co-polymerization of ethylene with 1-hexene has been performed with titanium precursors based on carboxylato ligands in the presence of organoaluminium compounds as activators to afford linear low-density polyethylenes (LLDPEs). The influence of the polymerization parameters was studied with particular reference to the type and amount of catalyst components, solvent, temperature, ethylene pressure, 1-hexene concentration. The chloro-substituted bis-carboxylato titanium complex resulted the most active precursor in the co-polymerization, allowing to obtain copolymers with modulable composition in the 1–5 mol % range of 1-hexene units. The obtained copolymers were characterized by thermal analysis, X-ray diffraction spectroscopy, FTIR and NMR techniques.