Thermal properties and morphology characteristics of a PP mono-filament and its foam / N. Chuapon in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 5 (11/2014)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 5 (11/2014) . - p. 579-587 Titre : Thermal properties and morphology characteristics of a PP mono-filament and its foam Type de document : texte imprimé Auteurs : N. Chuapon, Auteur ; O. Naithamon, Auteur ; Y. Sato, Auteur ; S. Areerat, Auteur ; Hiroshi Ito, Auteur Année de publication : 2014 Article en page(s) : p. 579-587 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Propriétés thermiques Monofilaments Morphologie (matériaux) Mousses plastiques Polypropylène Structure cristalline (solide) Index. décimale : 668.9 Polymères Résumé : The polypropylene (PP) mono-filament is an alternative material that can be used for insulation, packaging, and polymer composite applications. In this study, PP mono-filaments were prepared by extrusion free-fall at temperatures of 190, 200, and 210°C through a micro extrusion die with a diameter of 900??m. The free-fall speeds of the filament were controlled by a gear pump driving at speeds ranging from 12.5 to 20.0?min?1, and the extrudates were cooled at room temperature. The PP mono-filaments were subsequently foamed by a batch foaming process with sc-CO2 as the blowing agent at foaming temperatures of 165, 170, 175 and 180°C. The thermal properties and crystallinity of the prepared filaments and their foams were investigated using a DSC. The foam morphology and isotropic foam properties were characterized by SEM micrographs. The results show that the various morphologies of the PP mono-filament foams deviated from the isotropic foam behavior and had isotropic foam index values in the range of 1.1 to 2.3. In addition, the PP mono-filament that was foamed at 175°C expanded in the longitudinal direction and exhibited the highest expansion ratio, but its degree of crystallinity decreased compared to the mono-filaments. PP mono-filament foam represented a narrow crystallization temperature range and crystallization time than mono-filament and tended to a faster crystalline growth. DOI : 10.3139/217.2920 En ligne : https://drive.google.com/file/d/1457bKcafdihSgQ13yCVwGTbw2fqkDFjh/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22223 [article]

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