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

• Published in: Russian chemical bulletin 2018-02, Vol.67 (2), p.377-381
• Main Authors: Tuskaev, V. A., Gagieva, S. Ch, Kurmaev, D. A., Fedyanin, I. V., Zubkevich, S. V., Bulychev, B. M.
• Format: Article
• Language: English
• Subjects: Brief Communications; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Coordination compounds; ELASTICITY; ETHYLENE; Filaments; Inorganic Chemistry; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; MIXTURES; Modulus of elasticity; Molecular chains; MOLECULAR WEIGHT; NMR spectroscopy; NUCLEAR MAGNETIC RESONANCE; Organic Chemistry; ORIENTATION; PHENOL; Polyethylene; POLYETHYLENES; PRESSURE RANGE GIGA PA; SPECTROSCOPY; TENSILE PROPERTIES; THIN FILMS; TITANIUM; TITANIUM CHLORIDES; Titanium compounds; Ultra high molecular weight polyethylene; X-RAY DIFFRACTION
• ISSN: 1066-5285; 1573-9171
• DOI: 10.1007/s11172-018-2084-9

A reaction of 2,4-bis(α,α-dimethylbenzyl)phenol with TiCl 2 (ОPr i )2 and Ti(ОPr i ) 4 was used to obtain the coordination compounds (HL) 2 L 2 Ti 2 Cl 2 •MeC 6 H 5 and L 4 Ti 4 (OPr i ) 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 + Bu 2 Mg} or {3Et 3 Al 2 Cl 3 + Bu 2 Mg} 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 (ε = 2.67%) were obtained for the sample with a molecular mass of 3.14•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 Et 2 AlCl—Bu 2 Mg.