Propene-Norbornene Copolymers: Synthesis and Microstructure (Articolo in rivista)

Type
Label
  • Propene-Norbornene Copolymers: Synthesis and Microstructure (Articolo in rivista) (literal)
Anno
  • 2004-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1002/masy.200451405 (literal)
Alternative label
  • Boggioni L., Tritto I., Ragazzi M., Carbone P., Ferro D.R. (2004)
    Propene-Norbornene Copolymers: Synthesis and Microstructure
    in Macromolecular symposia; WILEY-V C H VERLAG GMBH,, D-69451 WEINHEIM, (Germania)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Boggioni L., Tritto I., Ragazzi M., Carbone P., Ferro D.R. (literal)
Pagina inizio
  • 39 (literal)
Pagina fine
  • 50 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://onlinelibrary.wiley.com/doi/10.1002/masy.200451405/abstract (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 218 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR (literal)
Titolo
  • Propene-Norbornene Copolymers: Synthesis and Microstructure (literal)
Abstract
  • Series of propene-norbornene (P-NI) copolymers were synthesized in the presence of two C-2 symmetric zirconocenes, rac-Et(Indenyl)(2)ZrCl2 (1) and rac-Me2Si(Indenyl)(2)ZrCl2 (2). and of the C-s symmetric zirconocene Me2C(Cp)(Fluorenyl)ZrCl2 (3) with MAO as cocatalyst. P-N copolymers were characterized by C-13 NMR spectroscopy, SEC, and DSC. A first assignment of the main C-13 NMR signals of P-N copolymers obtained with I and 2 containing isolated N units was obtained on the basis of DEPT experiments and by comparison with isotactic polypropene (i-PP) and E-N copolymer spectra. Ab initio theoretical C-13 NMR chemical shifts. combined with R.I.S. statistics of the P-N chain, gave important detailed indications for the assignment of the complex C-13 spectra of these copolymers. Such assignments were used to estimate the N copolymer content. The comparison of N content values obtained from the areas of different regions of the spectra reveals that 1,3 propene misinsertions are formed in greater amount as the [N]/[P] ratio of the feed increases. This may be due to the steric hindrance of the Mt-tertiary carbon bond when N is the last inserted unit, which makes difficult the next propene insertion and causes the low polymerization activities, molecular masses and T, The spectra of P-N copolymers obtained with 3 revealed to be even more complex. A limited assignment of the spectrum has been achieved. This allowed us to evaluate the N content in the copolymers and to evidence the low tendency of the C-s symmetric 3 to give 1,3 propene misinsertions in P-N copolymers. This is in agreement with the results observed with this catalyst in propene homopolymerization. (literal)
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