The influence of heteroatom on catalytic properties of heterobimetallic Ti(IV)–Ca and Ti(IV)–Ba complexes in the production of UHMWPE

Publication date: Available online 11 January 2020Source: Journal of Organometallic ChemistryAuthor(s): Svetlana Ch Gagieva, Vladislav A. Tuskaev, Dmitry A. Kurmaev, Vyacheslav S. Bogdanov, Sergey V. Zubkevich, Ivan V. Fedyanin, Elena S. Mikhaylik, Evgenii K. Golubev, Kasim F. Magomedov, Mikhail I. Buzin, Boris M. BulychevAbstractNew heterobimetallic Ti(IV)–Ca and Ti(IV)–Ba complexes stabilized with fluorinated ligand – 2-[bis-CF3-hydroxymethyl]-4,6-tert-butylphenol have been synthesized; their compositions and structures have been confirmed by NMR, IR-spectroscopy and elemental analysis. The solid-state structures of complexes 1–2 were established by X-ray analysis. These complexes catalyze ethylene polymerization in the presence of a binary cocatalyst {3Et2AlCl + Bu2Mg}. In the result of this reaction Ultra High Molecular Weight Polyethylene (UHMWPE) with a broad molecular weight distribution is obtained. UHMWPE samples were processed into high-strength (up to 2.4 GPa) and high-modulus (over 130 GPa) oriented film tapes by a solid-state uniaxial deformation. Such parameters of UHMWPE samples indirectly indicate a low degree of entanglements between the macromolecular chains. The effect of the pre-catalysts composition on the catalytic activity and properties of the obtained polymer has been investigated.

Source: Journal of Organometallic Chemistry - January 11, 2020 Category: Chemistry Source Type: research