Structure development in the melt spinning of polypropylene/ethylene butene copolymer blends and birefringence suppression effect / J. Yang in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 5 (11/2010)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 5 (11/2010) . - p. 346-355 Titre : Structure development in the melt spinning of polypropylene/ethylene butene copolymer blends and birefringence suppression effect Type de document : texte imprimé Auteurs : J. Yang, Auteur ; Q. Jiang, Auteur ; J. L. White, Auteur Année de publication : 2010 Article en page(s) : p. 346-355 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biréfringence La biréfringence est la propriété physique d'un matériau dans lequel la lumière se propage de façon anisotrope. Dans un milieu biréfringent, l'indice de réfraction n'est pas unique, il dépend de la direction de polarisation de l'onde lumineuse. (Wikipedia) Copolymère polypropylène-éthylène-butène Diffraction des rayons X à grand angle Extrusion filage Index. décimale : 668.9 Polymères Résumé : Polypropylene (PP)/ethylene butene copolymer (EBM) blends were melt-spun into fibers. The fiber orientation was determined by wide angle diffraction (WAXS) and birefringence. The birefringence of the blend fibers was much lower than that of the pure PP or EBM filaments spun at the same stresses. WAXS study showed that the PP phase had the same orientation versus stress relationship in its blends and in its pure state. However, EBM phase demonstrated much lower birefringence in its blends than in its pure state. The mechanism was explained as following. In melt spinning of the blends, the PP phase crystallized first. Before the PP phase crystallized, both PP and EBM phase had comparable modulus leading uniform stress distribution. After the PP phase crystallized, the modulus of PP phase became much larger than that of the EBM melt. Thus it would take most of the stress if it was the continuous phase leaving the EBM phase crystallizing at much lower stresses. This led to a large birefringence suppression of the EBM phase. In melt spinning of the blends with only 1 to 10 wt.% of PP, the dispersed PP phase could coalesce into a continuous surface layer. Thus small amount of PP could largely decrease the birefringence of EBM fibers. DOI : 10.3139/217.2320 En ligne : https://drive.google.com/file/d/17jwvlOVmh-X4cfD80WvtmqmJj3X5gtG4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10253 [article]

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