Chloride- and alkoxo-titanium(IV) complexes stabilized by 2-hydroxymethylphenol derivative as catalysts for the formation of ultra-high molecular weight polyethylene nascent reactor powders

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• 作者：Svetlana Ch. Gagieva^a ; ^{sgagieva@yandex.ru} ; Vladislav A. Tuskaev^a ; ^b ; Ivan V. Fedyanin^b ; Alexander I. Sizov^a ; Elena S. Mikhaylik^b ; ^c ; Evgenii K. Golubev^b ; ^c ; Boris M. Bulychev^a ;
• 关键词：Ziegler&ndash ; Natta polymerization ; Titanium ; UHMWPE
• 刊名：Polyhedron
• 出版年：2017
• 出版时间：28 January 2017
• 年：2017
• 卷：122
• 期：Complete
• 页码：179-183
• 全文大小：743 K
• 卷排序：122

文摘

A series of titanium(IV) complexes (2–6) stabilized by a substituted 2-hydroxymethylphenole (1) – were synthesized and characterized by NMR- and IR-spectroscopy. Structures of complexes 5–6 were established by X-ray diffraction. Titanium atom in the dimeric complex 5 has an octahedral environment created by chlorine atoms and five oxygen atoms. In the tetrameric complex 6 coordination polyhedra of Ti(1) atom is trigonal bipyramid and in Ti(2) – tetragonal pyramid with the environment of five oxygen atoms. Each complex contains alkoxo-groups and/or a chlorine atom easily leaving during treatment with magnesium- or organoaluminum compounds. All resulting complexes are moderately or highly active in ethylene polymerization in the presence of {3Et2AlCl + Bu2Mg} binary co-catalyst. Complexes 5 and 6 are significantly superior to previously described analogs 2–4 in thermal stability and catalytic activity. Resulting polymers are linear polyethylenes of high and ultrahigh molecular weight (over 2.5 · 105 g/mole) with a broad molecular weight distribution. Polymers are suitable for the modern methods of polymer processing – the solventless solid state formation of super high-strength (breaking strength over 1.5 GPa) and high-modulus (elastic modulus over 60 GPa) oriented films and film tapes.