Ethylene polymerization by a novel dinuclear heteroligated titanium complex with the ligand of (Salicylaldiminato) (β-enaminoketonato)

被引：0
作者：
Yujing Nie
Junquan Sun
Zhengzai Cheng
Lincai Wang
机构：
[1] Zhejiang University,Department of Chemical Engineering Institute of United Chemical Reaction Engineering, College of Material and Chemical Engineering
来源：
Journal of Wuhan University of Technology-Mater. Sci. Ed. | 2008年 / 23卷
关键词：
ethylene polymerization; titanium complex; binuclear;
D O I：
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中图分类号：
学科分类号：
摘要：
The condensation of acetylacetone (CH3COCH2COCH3) with benzdine (H2N-C6H4-C6H4-NH2) yielded diimine ligand 1 [HOC(Me)C(H)(Me)C=N(p-C6H4)(C6H4-p)N=C(Me)C(H)C(Me)OH)], which was converted into sodium salts. And then the sodium salts reacted with monosalicylaldiminato titanium complex 2{[3,5-di-But-2-(O)C6H2CHN(PH)]TiCl3(THF)} in dried dichloromethane to give a new benzdine-bridged binuclear complex 3{[3,5-di-But-2-(O)C6H2CHN(PH)]2[OC(Me)C(H)(Me)C=N(p-C6H4)-(C6H4-p)N=C(Me)C(H) C(Me)]Ti2Cl4}. The complex 3 was characterize by 1HNMR and elemental analysis. In the presence of MAO(methylaluminoxane), the complex 3 in toluene was effective to catalyze polymerization, affording moderately high catalytic activity 1.93×105 g PE /(mol·Ti·h)]and high molecular weight polyethylene [5.63×105 g/mol]. The high temperature gel permeation chromatography (GPC) curve of polyethylene obtained revealed a single peak, but the molecular weight distribution (MWD=3.21) is obviously broader than that of the similar mononuclear titanium complex. The melting points of the obtained polyethylene reaches 138 °C, indicating that the polyethylene is of high crystallinity.
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页码：821 / 824
页数：3
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