New titanium coordination compounds with 2-hydroxybenzyl alcohol derivatives used in the preparation of ultrahigh molecular weight polyethyleneстатья
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Дата последнего поиска статьи во внешних источниках: 11 сентября 2018 г.
Аннотация:A reaction of 2,4bis(α,αdimethylbenzyl)phenol with TiCl2(ОPri)2 and Ti(ОPri)4 was
used to obtain the coordination compounds (HL)2L2Ti2Cl2•MeC6H5 and L4Ti4(OPri)8,
respectively. The compounds were characterized by elemental analysis, NMR spectroscopy,
and Xray diffraction. The titanium(IV) coordination compounds obtained polymerize ethyl
ene in the presence of binary cocatalysts {3Et2AlCl + Bu2Mg} or {3Et3Al2Cl3 + Bu2Mg} at
moderate to high rates, giving rise to ultrahigh 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•106 Da under
comparable conditions of orientation drawing of the film filaments. This sample was obtained
when complex (HL)2L2Ti2Cl2 was activated by a 3 : 1 mixture of Et2AlCl—Bu2Mg