科研之友
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摘要
Ethylene polymerization with a titanium complex [N, N-ethylenebis(3-methoxysalicylideneiminato) titanium dichloride] immobilized on the magnesium support with the formula MgCl2(THF)(0.32)(Et2AlCl)(0.36) was studied. In particular, the effects of polymerization temperature, monomer pressure, and polymerization time on the activity of the catalyst and on the polyethylene properties (molecular weight and its distribution, melting point, crystallinity, and bulk density) were evaluated. The findings of investigations prove that the studied supported titanium catalyst is highly active in ethylene polymerization, and its activity increases with increasing temperature and monomer pressure. Moreover, stability of the catalytic systems is dependent on the activator type used. Me3Al, when employed as an activator, makes the catalytic system undergo no deactivation in practice. The catalyst coupled with MAO turned out less stable.
- 出版日期2012-2-5
