Polymerization of 4-methyl-1,3-pentadiene with catalysts based on cyclopentadienyl titanium chlorides. Effect of anti-syn isomerism of the allylic group on chemoselectivity and the role of backbiting coordination in 1,3-diene polymerization (Articolo in rivista)

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  • Polymerization of 4-methyl-1,3-pentadiene with catalysts based on cyclopentadienyl titanium chlorides. Effect of anti-syn isomerism of the allylic group on chemoselectivity and the role of backbiting coordination in 1,3-diene polymerization (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1002/macp.200500135 (literal)
Alternative label
  • Cugini, C.; RombolĂ , O. A.,; Giarrusso, A.; Porri, L.; Ricci, G. (2005)
    Polymerization of 4-methyl-1,3-pentadiene with catalysts based on cyclopentadienyl titanium chlorides. Effect of anti-syn isomerism of the allylic group on chemoselectivity and the role of backbiting coordination in 1,3-diene polymerization
    in Macromolecular chemistry and physics (Print); WILEY-V C H VERLAG GMBH,, D-69451 WEINHEIM, (Germania)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Cugini, C.; RombolĂ , O. A.,; Giarrusso, A.; Porri, L.; Ricci, G. (literal)
Pagina inizio
  • 1684 (literal)
Pagina fine
  • 1690 (literal)
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  • 206 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 7 (literal)
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  • 16 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Politecnico Milano; CNR-ISMAC Istituto per lo Studio ddelle Macromolecole (literal)
Titolo
  • Polymerization of 4-methyl-1,3-pentadiene with catalysts based on cyclopentadienyl titanium chlorides. Effect of anti-syn isomerism of the allylic group on chemoselectivity and the role of backbiting coordination in 1,3-diene polymerization (literal)
Abstract
  • Homopolymerization of 4-methyl-1,3-pentadiene (MP) and copolymerization of 4-methyl-1,3-pentadiene with alkenes (ethylene, 1-pentene, 4-methyl-1-pentene) were performed to investigate the effect of the so-called backbiting coordination on the chemoselectivity of 1,3-diene polymerization. Three homogeneous catalyst systems were used: CpTiCl3-MAO, Cp2TiCl2-MAO and Cp2TiCl-MAO. Backbiting coordination is possible with the first catalyst, but not with the other two. The three catalysts gave similar results, which indicates that backbiting has no effect on the polymerization chemoselectivity, contrary to what has been reported in recent literature. An interpretation is presented for the formation of 1,4 units in MP/alkene copolymers. This interpretation is based on the fact that allyl groups have predominantly a syn configuration in MP homopolymerization, whereas allyl groups of anti configuration are formed in MP/alkene copolymerization. The role of backbiting in diene polymerization is discussed. (literal)
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