http://www.cnr.it/ontology/cnr/individuo/prodotto/ID272906
Ethene/propene copolymerisations with rac-EBTHIZrR2/alumoxane: sigma-ligands effect (Articolo in rivista)
- Type
- Label
- Ethene/propene copolymerisations with rac-EBTHIZrR2/alumoxane: sigma-ligands effect (Articolo in rivista) (literal)
- Anno
- 2000-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1016/S1381-1169(00)00215-6 (literal)
- Alternative label
Polo E.; Galimberti M.; Mascellani N.; Fusco O.; Müller G.; Sostero S. (2000)
Ethene/propene copolymerisations with rac-EBTHIZrR2/alumoxane: sigma-ligands effect
in Journal of molecular catalysis. A, Chemical (Print); ELSEVIER SCIENCE B.V., AMSTERDAM (Paesi Bassi)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Polo E.; Galimberti M.; Mascellani N.; Fusco O.; Müller G.; Sostero S. (literal)
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- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
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- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
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- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Polo E.; C.N.R. -- Centro di Studio su Fotoreattività e Catalisi, Ferrara
Polo E.; C.N.R. -- Centro di Studio su Fotoreattività e Catalisi, Ferrara
Galimberti M.; Montell Italia S.p.A., G. Natta Research Centre, Ferrara
Mascellani N.;Dipartimento di Chimica dell'UniÍersita di Ferrara
Fusco O.; Montell Italia S.p.A., G. Natta Research Centre, Ferrara
Müller G.; Dipartimento di Chimica dell'Universita di Ferrara
Sostero S.;Dipartimento di Chimica dell'Universita di Ferrara (literal)
- Titolo
- Ethene/propene copolymerisations with rac-EBTHIZrR2/alumoxane: sigma-ligands effect (literal)
- Abstract
- We report here about the role played by the sigma-ligands of a metallocene in ethene/propene (E/P)
copolymerisations promoted by rac-[ethylenebis(4,5,6,7-tetrahydro-1-indenyl)]zirconium dichloride i, and its corresponding
dimethyl derivative rac-EBTHIZrMe2 2 and binaphtholate rac-EBTHIZr(BNP) 3 derivative, in the presence of several
alumoxanes,
Alumoxanes alternative to the traditional polymethylalumoxane (MAO) were synthesised and characterised. They are based on
Al(2,4,4-trimethylpentyl)3 (TIOA) 4 and were prepared by reaction of 4 with water to give either tetraisooctylalumoxane
(TIOAO) 5 or polyisooctylalumoxane (TAO) 6 depending on the stoichiometry of the reaction. H-1 NMR spectra of these
products are characterised by the presence of broad bands and of resolved multiplets. Their relative amount in the region
between 1.9 and 2.5 ppm was identified as the \"fingerprint\" of the polymerisation activity. A comparison of the results obtained
in polymerisation with metallocenes having different sigma-ligands allowed us to shed more light on the role played by those
species.
In conclusion, the nature of the sigma-ligands of a metallocene affects its catalytic activity in polymerisation, as a function of
the alumoxane employed and of the relative ratio with the metallocene, and this effect is enhanced in \"critical conditions,\" i.e.
with a weakly activating cocatalyst or at a low Al/Zr ratio. (literal)
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