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

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.Serenko; Boris M.Bulychev

来源：Chinese Journal of Polymer Science, 2019, 37(05): 471-477.

Binuclear and hexanuclear titanium complexes stabilized by tetradentate [OOOO]4–-type ligand were active in ethylene polymerization in the presence of Et2 AlCl/Bu2 Mg 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 highmodulus(over 100 GPa) oriented film tapes, which indirectly indicates a low degree of entanglements between the macromolecular chains.