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Auteur S. Rettenberger |
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Simultaneous biaxial stretching of polypropylene resins of varying tacticity / L. Capt in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 4 (12/2005)
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Titre : Simultaneous biaxial stretching of polypropylene resins of varying tacticity : Part II : Film morphology and properties Type de document : texte imprimé Auteurs : L. Capt, Auteur ; S. Rettenberger, Auteur ; H. Münstedt, Auteur ; Musa R. Kamal, Auteur Année de publication : 2005 Article en page(s) : p. 369-379 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The simultaneous biaxial stretching behavior of three Ziegler-Natta-based isotactic polypropylene resins of varying isotacticity was studied using a laboratory film stretcher that simulates closely stretching conditions encountered in the commercial process. The effect of isotacticity on the final morphology and end film properties was associated with the effect of isotacticity on the thermal properties of the resin. The results showed that the degree of undermelting, (delta) Tum = Tm–T, determines the phase composition of the polymer before stretching and the morphology and orientation of the stretched films. The size and orientation of the crystallites in the stretching plane is mostly determined by the degree of undermelting. The elongation at break was correlated with the residual crystallinity of the film before stretching, and the elastic modulus was correlated with the final degree of crystallinity and the density of tie chains. En ligne : https://drive.google.com/file/d/1tgOrSORI2P-gqkg5hc4mXcpKqBvAhkXa/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2962
in INTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 4 (12/2005) . - p. 369-379[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003422 - Périodique Bibliothèque principale Documentaires Disponible Simultaneous biaxial stretching of PP resins of varying / L. Capt in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 1 (03/2005)
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Titre : Simultaneous biaxial stretching of PP resins of varying : Tacticity melting and deformation behavior Type de document : texte imprimé Auteurs : L. Capt, Auteur ; S. Rettenberger, Auteur ; H. Münstedt, Auteur ; Musa R. Kamal, Auteur Année de publication : 2005 Article en page(s) : p. 35-46 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The melting and simultaneous biaxial stretching behavior of three Ziegler-Natta isotactic polypropylene resins of varying isotacticity was studied. DSC melting experiments showed that the crystallinity and melt stability of the crystalline phase depend strongly on tacticity and on the degree of undermelting, Delta T = Tm–T, where Tm is the melting temperature. The level of biaxial yield stress depends on the fraction of residual "unmolten" crystallinity and the crystallite size. For specimens with same thermal history, the post-yield deformation shows strong dependence on the degree of undermelting, delta T. The deformation homogeneity and the resulting film thickness may be related to the thermal mobility of the chains and the tie chain and entanglement densities. DOI : 10.3139/217.1867 En ligne : https://drive.google.com/file/d/1DSnN2JaRS7LdBD_xx8Ox7uBm2a7BMBa6/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3088
in INTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 1 (03/2005) . - p. 35-46[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 000687 - Périodique Bibliothèque principale Documentaires Disponible