The meso ansa zirconocene with dimethylsilyl bridge, activated by methylalumoxane, catalyses the ethylene polymerization, producing ethyl-branched polyethylene. With respect to the polymers obtained with the previously investigated meso zirconocenes, we have found higher branching amount and lower molecular weight. The rapid β-H transfer from the growing chain to the coordinated monomer could account for both these features of the polymer. The investigation on the structural parameters of the complex, through X-ray diffraction analysis, and on the electrophilicity of the cationic center, through NMR experiments, suggests, as a possible rationalization of this behavior, the obstruction in the inward site. © 2004 Elsevier B.V. All rights reserved.
|Data di pubblicazione:||2005|
|Titolo:||meso-Me2Si(1-indenyl)2ZrCl2/ methylalumoxane catalyzed polymerization of the ethylene to ethyl-branched polyethylene|
|Rivista:||JOURNAL OF MOLECULAR CATALYSIS. A: CHEMICAL|
|Digital Object Identifier (DOI):||10.1016/j.molcata.2004.12.002|
|Codice identificativo ISI:||WOS:000227845200005|
|Codice identificativo Scopus:||2-s2.0-14644444175|
|Appare nelle tipologie:||Articolo su Rivista|