Orientation and mechanical properties of extrusion cast PA 12 films in biaxial stretching process / S. Rhee in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 4 (12/2001)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVI, N° 4 (12/2001) . - p. 388-397 Titre : Orientation and mechanical properties of extrusion cast PA 12 films in biaxial stretching process Type de document : texte imprimé Auteurs : S. Rhee, Auteur ; J. L. White, Auteur Année de publication : 2001 Article en page(s) : p. 388-397 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The levels in biaxial orientations and mechanical properties of stretched extrusion cast polyamide 12 films were investigated with birefringence, wide angle X-ray diffraction (WAXD) pole figure and mechanical testing. Introduction of a pseudo-orthogonal crystalline symmetry enabled the calculation of White-Spruiell biaxial orientation factors using WAXD pole figure data. The orientation was uniaxial or biaxial depending on the stretch ratios along two principal stretching directions that are the machine direction (MD) and the transverse direction (TD). According to the WAXD pole figure patterns, planar alignments of hydrogen bonded layers were formed with respect to the film surface from most of the stretched films. Balanced stretching at higher stretch ratios enhanced the planarity. It was found that the mechanical properties (tensile strength and elongation at break) of the films had a close correlation with the out-of-plane birefringences. DOI : 10.3139/217.1665 En ligne : https://drive.google.com/file/d/1vR--kqxcBKUdWg_waozhlmnPjjBAetnL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15923 [article]

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PA612 double bubble tubular film process - Processability and structure development / S. Rhee in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 3 (09/2001)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVI, N° 3 (09/2001) . - p. 272-284 Titre : PA612 double bubble tubular film process - Processability and structure development Type de document : texte imprimé Auteurs : S. Rhee, Auteur ; J. L. White, Auteur Année de publication : 2001 Article en page(s) : p. 272-284 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Biaxially oriented Polyamide 612 (PA612) films made by double bubble tubular film extrusion were characterized. The processing characteristics of the polymer in the double bubble process were investigated. The development of crystallinity and orientation in the films was clearly considered. First bubble PA612 films showed a low level of crystallinity (X = 7.7 %). Differential scanning calorimetry (DSC) indicated that the first bubble PA 612 films experienced a considerable increase in glass transition temperature (Tg), cold crystallization temperature (Tc) and crystallinity during aging at room conditions. The second bubble films were more highly crystalline (X = 22 to 28 %) with poorly grown β unit cells. The WAXD and SAXS patterns showed that the crystallites of double bubble PA612 films became more perfect by annealing in a boiling 20 % formic acid solution, resulting in a well-developed triclinic α crystals coexisting with minor proportion of β phase. the WAXD and SAXS patterns indicated that crystallographic planes and lamellae in the second bubble films were oriented depending on SBUR x SDDR (second blow-up ratio x second draw down ratio). White-Spruiell biaxial orientation factors were calculated with the WAXD pole figure data. The hydrogen bonding (0k0) planes of biaxial double bubble films were found by WAXD to be aligned parallel to the sheet surface before and after annealing. Note de contenu : - EXPERIMENTAL : Material - Film formation - Annealing - Film characterization (Differential scanning calorimetry DSC, Wide angle X-RAY diffraction WAXD flat film patterns and pole figures, Infrared IR spectroscopy, Small angle X-RAY diffraction SAXS) - RESULTS : Bubble stability - Differntial scanning calorimetry DSC - WAXD flat film patterns - IR (Infrared) spectroscopy - Pole figures - Small angle X-RAY diffraction SAXS - DISCUSSION : Bubble stability - Thermal properties - Crystal structure - IR spectroscopy - Orientation factors - Crystal superstructure DOI : 10.3139/217.1647 En ligne : https://drive.google.com/file/d/1anPOZPYobL1ryPHNEB7CjO5Gq95O1H9t/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15908 [article]

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