Dissymmetric dinuclear transition metal complexes as dual site catalysts for the polymerization of ethylene
作者： Helmut G. Alt , Haif Alshammari
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摘要: Aseries of dissymmetric dinuclear complexes were synthesized, as dual site catalysts in ethylene polymerization, by coupling the allylated a-diimine metals Ti, Zr, V, Ni and Pd with ansa-zirconocene complex [C 5 H 4 -SiH(Me)-C ]ZrCl 2 possessing a hydride silane moiety. The different stages syntheses included formation bis(cyclopentadienide)methyl which was utilized to prepare silyl-bridged zirconocene complexes. prepared mixing latter alpha-diimine via hydrosilylation reaction using Karstedt catalyst, platinum (0)1,3 divinyl-1,1,3,3,-tetramethyldisiloxane react at room temperature for 40 h. These activated methylaluminoxane (MAO) tested polymerization ethylene. showed various activities depending on nature produced polyethylenes broad or bimodal molecular weight distributions. trend was: Ni>Pd>V>Zr>Ti. almost double their analogous precursors. Polyolefins J (2014) 1: 107-116
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