Cis-1,4-alt-3,4 Polyisoprene: Synthesis and Characterization (Articolo in rivista)

Type
Label
  • Cis-1,4-alt-3,4 Polyisoprene: Synthesis and Characterization (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/ma901864e (literal)
Alternative label
  • Ricci G.; Leone G.; Boglia A.; Boccia A. C.; Zetta L. (2009)
    Cis-1,4-alt-3,4 Polyisoprene: Synthesis and Characterization
    in Macromolecules (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Ricci G.; Leone G.; Boglia A.; Boccia A. C.; Zetta L. (literal)
Pagina inizio
  • 9263 (literal)
Pagina fine
  • 9267 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://pubs.acs.org/doi/pdf/10.1021/ma901864e (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 42 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 23 (literal)
Note
  • Scopu (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Ricci G. CNR-ISMAC-Milano, Leone G. CNR-ISMAC-Milano, Boglia A. CNR-ISMAC-Milano, Boccia A. C. CNR-ISMAC-Milano, Zetta L. CNR-ISMAC-Milano (literal)
Titolo
  • Cis-1,4-alt-3,4 Polyisoprene: Synthesis and Characterization (literal)
Abstract
  • We recently reported on the synthesis and characterization of CoCl2(PRPh2)2 (R=methyl, ethyl, n-propyl, isopropyl, and cyclohexyl). The catalyst systems obtained by combining the above complexes with methylaluminoxanes (MAO) were highly active in the polymerization of 1,3-dienes, giving 1,2 syndiotactic polymers from butadiene and terminally substituted butadienes (e.g., E-1,3-pentadiene and E-1,3-hexadiene) and 1,2 isotactic polymers from internally substituted 1,3-dienes such as E-3-methyl-1,3- pentadiene. We have now polymerized isoprene with the same cobalt catalysts, and unexpectedly the polymers obtained resulted to have an equibinary, alternating cis-1,4/3,4 structure, as indicated by the two-dimensional NMR data. A structure of this type is rather unusual in the field of diolefins stereospecific polymerization, and only few cases have been reported in the literature. Aninterpretation for the formation of such a polymer is proposed. The structure of cis-1,4-alt-3,4 polyisoprene, with alternating sequences of in-chain and side-chain double bonds, makes it of potential interest in view of a possible selective functionalization of the double bonds. (literal)
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