LLDPE with exclusively ethyl branches by tandem catalysis with single-site Zr(IV)/Co(II) catalysts (Articolo in rivista)

Type
Label
  • LLDPE with exclusively ethyl branches by tandem catalysis with single-site Zr(IV)/Co(II) catalysts (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1007/s11244-008-9053-8 (literal)
Alternative label
  • Bianchini C., Giambastiani G., Guerrero Rios I., Meli A., Toti A., Passaglia E., Frediani M. (2008)
    LLDPE with exclusively ethyl branches by tandem catalysis with single-site Zr(IV)/Co(II) catalysts
    in Topics in catalysis
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Bianchini C., Giambastiani G., Guerrero Rios I., Meli A., Toti A., Passaglia E., Frediani M. (literal)
Pagina inizio
  • 107 (literal)
Pagina fine
  • 113 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 48 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • ICCOM-CNR, Area della Ricerca CNR di Firenze, via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy ICCOM-CNR, section of Pisa, c/o Dipartimento di Chimica e Chimica Industriale, Universita` di Pisa, via Risorgimento 35, 56126 Pisa, Italy Dipartimento di Chimica Organica, Universita` di Firenze, Polo Scientifico, via della Lastruccia 13, 50019 Sesto Fiorentino, Italy (literal)
Titolo
  • LLDPE with exclusively ethyl branches by tandem catalysis with single-site Zr(IV)/Co(II) catalysts (literal)
Abstract
  • Semicrystalline linear low density polyethylenes (LLDPEs) with exclusively ethyl branching (from 7 to 56 branches per 1,000 carbon atoms) were prepared from ethylene by homogeneous tandem catalytic systems comprising (imino)pyridine cobalt(II) dichlorides as oligomerization precursors, bis(cyclopentadienyl)zirconium(IV) dichloride as copolymerization precursor and methyaluminoxane as activator. The activity of the tandem systems was evaluated by varying either the molar fraction of the cobalt precursors or the ethylene pressure. The latter parameter was of crucial importance to control both the productivity and the extent of 1-butene incorporation. In particular, increasing the ethylene pressure from 2 bar to 4 bar changed the ''comonomer effect'' from positive to negative. (literal)
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