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Crystallization kinetics of iPP: Influence of operating conditions and molecular parameters

La Carrubba, V. ; Piccarolo, S. ; Brucato, V.

Journal of applied polymer science, 2007-04, Vol.104 (2), p.1358-1367 [Periódico revisado por pares]

Hoboken: Wiley Subscription Services, Inc., A Wiley Company

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  • Título:
    Crystallization kinetics of iPP: Influence of operating conditions and molecular parameters
  • Autor: La Carrubba, V. ; Piccarolo, S. ; Brucato, V.
  • Assuntos: Applied sciences ; Crystallization ; density ; Exact sciences and technology ; Organic polymers ; Physicochemistry of polymers ; polyolefins ; processing ; Properties and characterization ; WAXS
  • É parte de: Journal of applied polymer science, 2007-04, Vol.104 (2), p.1358-1367
  • Notas: ark:/67375/WNG-HBPHKR3C-J
    ArticleID:APP25871
    The Italian Government MURST Funds (40% Quota)
    EU Brite - No. BRPR.CT96.0147
    istex:386549A56317C9C62B4EFA5EEDDABF434F434E53
    ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-Feature-1
    content type line 23
  • Descrição: An analysis of the crystallization kinetics of different grades of isotactic polypropylene (iPP) is here presented. To describe the crystallization kinetics as a function of molecular and operating parameters, the methodological path followed was the preparation of quenched samples of known cooling histories, calorimetric crystallization isotherms tests, differential scanning calorimetry cooling ramps, wide angle X‐ray diffraction (WAXD) measurements, and density determination. The WAXD analysis performed on the quenched iPP samples confirmed that during the fast cooling at least a crystalline structure and a mesomorphic one form. The diffractograms were analyzed by a deconvolution procedure, to identify the relationship between the cooling history and the distribution of the crystalline phases. The whole body of results (including calorimetric ones) provides a wide basis for the identification of a crystallization model suitable to describe solidification in polymer‐processing operations, based on the Kolmogoroff–Avrami–Evans nonisothermal approach. The kinetic parameters, determined for all the materials, are discussed, highlighting the effect of molecular parameters on the crystallization kinetics: molecular mass and distribution, tacticity, nucleating agents, and ethylene units content. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 1358–1367, 2007
  • Editor: Hoboken: Wiley Subscription Services, Inc., A Wiley Company
  • Idioma: Inglês
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