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- W2054493952 abstract "Heterogeneous ethylene polymerization catalysts were prepared by supporting tetrakis(dimethylamino)zirconium on chemically modified silica surface. The silica was modified with a silane coupling agent, Cp(CH2)3Si(OEt)3, using ALCVD-technique. On the resulting cyclopentadienyl surface zirconium amide, Zr(NMe2)4, was immobilized with and without using methyllithium. Depending on the use of methyllithium the immobilization resulted in either mono- or bis-cyclopentadienyl zirconium complexes, which were characterized using chemical analysis, FT-IR, 13C- and 29Si-NMR results. Moreover, a homogeneous model compound, (Me3SiCp)2Zr(NMe2)2, was synthesized with a reaction between Zr(NMe2)4 and Me3SiCp. The preliminary results of ethylene polymerization with these supported and unsupported organometallic complexes are presented." @default.
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- W2054493952 date "1999-06-01" @default.
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- W2054493952 title "Immobilization of zirconium amide on a Cp-modified silica surface and its use as a catalyst for ethylene polymerization" @default.
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- W2054493952 doi "https://doi.org/10.1016/s0022-328x(99)00063-7" @default.
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