New titanium(IV) coordination compounds with 2-hydroxybenzyl alcohol derivatives used in the preparation of ultra-high molecular weight polyethylene

摘要

A reaction of 2,4-bis(alpha,alpha-dimethylbenzyl)phenol with TiCl2(DPri)(2) and Ti(DPri)(4) was used to obtain the coordination compounds (HL)(2)L(2)Ti(2)Cl(2)aEuro center dot MeC6H5 and L4Ti4(OPri)(8), respectively. The compounds were characterized by elemental analysis, NMR spectroscopy, and X-ray diffraction. The titanium(IV) coordination compounds obtained polymerize ethylene in the presence of binary cocatalysts {3Et(2)AlCl + Bu2Mg} or {3Et(3)Al(2)Cl(3) + Bu2Mg} at moderate to high rates, giving rise to ultra-high molecular weight polyethylene with a wide range of molecular masses. The highest values of tensile strength (2.4 GPa) and modulus of elasticity (epsilon = 2.67%) were obtained for the sample with a molecular mass of 3.14aEuro.10(6) Da under comparable conditions of orientation drawing of the film filaments. This sample was obtained when complex (HL)2L(2)Ti(2)Cl(2) was activated by a 3:1 mixture of Et2AlCl-Bu2Mg.