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From zirconium to titanium: the effect of the metal in propylene polymerisation using fluxional unbridged bicyclic catalysts (Articolo in rivista)

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From zirconium to titanium: the effect of the metal in propylene polymerisation using fluxional unbridged bicyclic catalysts (Articolo in rivista) (literal)

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Alternative label

Polo E.; Losio S.; Forlini F.;Locatelli P.; Sacchi M.C. (2004)
From zirconium to titanium: the effect of the metal in propylene polymerisation using fluxional unbridged bicyclic catalysts
in Macromolecular symposia; Wiley-VCH Verlag Gmbh, Weinheim (Germania)
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Il cognome del terzo autore è stato erroneamente scritto: \"Fortini\" invece di \"Forlini\", probabilmente a causa di una impostazione del PC che non è stata corretta. I coautori sono i medesimi che compaiono con \"Fabrizio Forlini\" in altri articoli inseriti, e anche l'affiliazione è la stessa di \"Fabrizio Forlini\" negli altri articoli inseriti. Essendo oltretutto il nome sempre \"Fabrizio\", è evidente che si tratta di \"Fabrizio Forlini\" e non di \"Fabrizio Fortini\". Articolo su invito scelto fra le comunicazioni orali del Meeting on Stereospecific Polymerization and Stereoregular Polymers, Milan, ITALY, JUN 08-12, 2003 (literal)

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Polo E.; CNR ISOF, sez. Ferrara Losio S.; Forlini F.;Locatelli P.; Sacchi M.C., CNR ISMAC, Milano (literal)

Titolo

From zirconium to titanium: the effect of the metal in propylene polymerisation using fluxional unbridged bicyclic catalysts (literal)

Abstract

Catalytic systems based on unbridged substituted indenyl systems are becoming of interest in the production of elastomeric polypropylene. A full understanding of the structural features necessary to control this kind of behaviour has not yet been achieved, since relatively slight changes in the molecular architecture can lead to polymers with remarkably different properties. We report here our recent findings regarding the study of bicyclic zirconium and titanium complexes as fluxional catalysts in propylene polymerisation. Most of them have been synthesised according to a synthetic procedure that allowed us to prepare a series of complexes in which the ring fused to the cyclopentadienyl moiety is saturated and of different sizes, thus introducing a flexibility parameter that can be finely tuned. The results obtained show that the stereoselectivity induced by this class of catalysts strongly depends both on the structure of the ligand and on the nature of metal atom (Zr vs. Ti). The titanium-based catalysts yield polypropylenes with new and interesting microstructures, in particular when an higher stability is achieved through a careful choice of the substitution pattern of the ligands. (literal)

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