Matches in SemOpenAlex for { <https://semopenalex.org/work/W2043271489> ?p ?o ?g. }
- W2043271489 abstract "The effect of cyclopentadienyl ring substitution on the immobilization and activation of zirconocenes on supports of type MgCl2/AlRn(OEt)3-n has been investigated. Comparison of the activity of immobilized zirconocenes (RCp)2ZrCl2 in ethylene polymerization, using simple aluminum alkyls such as AlEt3 or AliBu3 as a cocatalyst, revealed a remarkable effect of the substituent R in the cyclopentadienyl ring. Low activity (<300 kg/mol bar h) was obtained with R = H or Et, but longer alkyl substituents, notably n-Pr or n-Bu, gave more than an order of magnitude increase in activity. Zirconocenes with branched substituents (i-Pr, t-Bu) were less easily immobilized and gave relatively low activity, while the activities of zirconocenes of composition Cp(RCp)ZrCl2 (R = n-Pr, n-Bu, n-pentyl) were intermediate between those of Cp2ZrCl2 and (RCp)2ZrCl2. Experiments carried out under homogeneous conditions with aluminoxane cocatalysts indicated that the effect of cyclopentadienyl ring substitution can be related to di..." @default.
- W2043271489 created "2016-06-24" @default.
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- W2043271489 date "2008-02-01" @default.
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- W2043271489 title "Zirconocene Immobilization and Activation on MgCl2-Based Supports: Factors Affecting Ethylene Polymerization Activity" @default.
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- W2043271489 doi "https://doi.org/10.1021/ma7024557" @default.
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