Binuclear and Hexanuclear Ti(IV) Complexes Supported by [OOOO]4–-type Ligand for Preparing Disentang

• 作 者: Vladislav A. Tuskaev Svetlana Ch. Gagieva Dmitry A. Kurmaev Viktor G. Vasil’ev Nikolay A. Kolosov Sergey V. Zubkevich Elena S. Mikhaylik Evgenii K. Golubev Galina G. Nikiforova Pavel A. Zhizhko Olga A
• 机 构: Department of Chemistry, M. V. Lomonosov Moscow State University, 1 Leninskie Gory, Moscow 119992, R
• 出 处: 高分子科学（英文版）
• 发表日期: 2019年5期
• 关键词: Binuclear catalysts Titanium Ethylene Ziegler-Natta polymerization UHMWPE

Binuclear and hexanuclear titanium complexes stabilized by tetradentate [OOOO]4–-type ligand were active in ethylene polymerization in the presence of Et2AlCl/Bu2Mg binary co-catalyst, giving high molecular weight polyethylene. The binuclear complex showed significantly higher catalytic activity and thermal stability in comparison to mononuclear analogue. Ultra high molecular weight polyethylene (UHMWPE) samples were processed by a solid-state uniaxial deformation into high-strength (up to 2.5 GPa) and high-modulus (over 100 GPa) oriented film tapes, which indirectly indicates a low degree of entanglements between the macromolecular chains.