EVIDENCE OF 2 DIFFERENT CRYSTALLINE PHASES OF ISOTACTIC TRANS-1,4-POLY(1,3-PENTADIENE) - AN APPLICATION OF THE RIETVELD METHOD (Articolo in rivista)

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  • EVIDENCE OF 2 DIFFERENT CRYSTALLINE PHASES OF ISOTACTIC TRANS-1,4-POLY(1,3-PENTADIENE) - AN APPLICATION OF THE RIETVELD METHOD (Articolo in rivista) (literal)
Anno
  • 1986-01-01T00:00:00+01:00 (literal)
Alternative label
  • Brückner S.; Di Silvestro G.; Porzio W. (1986)
    EVIDENCE OF 2 DIFFERENT CRYSTALLINE PHASES OF ISOTACTIC TRANS-1,4-POLY(1,3-PENTADIENE) - AN APPLICATION OF THE RIETVELD METHOD
    in Macromolecules (Print); American Chemical Society, Washington, DC (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Brückner S.; Di Silvestro G.; Porzio W. (literal)
Pagina inizio
  • 235 (literal)
Pagina fine
  • 239 (literal)
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  • http://apps.webofknowledge.com/full_record.do?product=WOS&search_mode=GeneralSearch&qid=1&SID=Y2glE8D@GK7EjebLL5F&page=17&doc=169 (literal)
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  • 19 (literal)
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  • 5 (literal)
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  • 1 (literal)
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  • ISI Web of Science (WOS) (literal)
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  • Politecnico Milano, Istituto di chimica delle Macromolecole (literal)
Titolo
  • EVIDENCE OF 2 DIFFERENT CRYSTALLINE PHASES OF ISOTACTIC TRANS-1,4-POLY(1,3-PENTADIENE) - AN APPLICATION OF THE RIETVELD METHOD (literal)
Abstract
  • ABSTRACT: An X-ray analysis has been performed according to the Rietveld whole-fitting method on a bulk-crystallized, annealed sample of isotactic trans-1,4-poly( 1,3-pentadiene). Calculated spectra have been obtained for different conformers in which the side methyl groups are in a cis or skew arrangement with respect to the adjacent double bonds. Comparison with the observed profile indicates that the skew conformation only gives a good agreement. This conclusion agrees with results already obtained by Neto et al. after a vibrational analysis of the same polymer. A comparison with intensities observed by Bassi et al. on an oriented fiber X-ray diagram shows however several major discrepancies. We deduce therefore the existence of two different crystalline phases that can be respectively observed in the bulk-crystallized polymer and in the sample stretched at a high temperature. (literal)
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