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Analysis of the morphological development of PBT/ABS blends during the twin screw extrusion and injection molding processes / E. N. Ito in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 4 (12/2003)
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Titre : Analysis of the morphological development of PBT/ABS blends during the twin screw extrusion and injection molding processes Type de document : texte imprimé Auteurs : E. N. Ito, Auteur ; L. A. Pessan, Auteur ; Jose A. Covas, Auteur ; E. Hage, Auteur Année de publication : 2003 Article en page(s) : p. 376 - 381 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Molding - The aim of this work was to observe the development of the phase morphology of the PBT/ABS blends during their extrusion mixing and injection molding steps. The evolution of the blend morphology during the mixing stage was analyzed using a specially designed co-rotational twin-screw extruder with a collecting device located along the barrel. Blend samples were collected inline along the length of the extruder barrel during the blending process. Samples obtained from the extruded pellets and from injection molded specimens were also used to observe the blend morphology. All the samples were observed by transmission electron microscopy (TEM). They were prepared by cryo-ultramicrotomy and the rubbery phase of the ABS contained in the blends was stained with osmium tetroxide (OsO4).
A special function was established and is proposed to analyze the blend morphology trends through image analysis. In binary blends, the ABS phase showed better dispersion after the mixture passed through the extruder die. However, a coalescence phenomenon was observed during the next molding step. Compatibilized PBT/ABS blends showed better dispersion than binary blends, even after injection molding. The special function used to quantify the dispersion throughout the mixing and molding steps showed an excellent performance.Note de contenu : - MATERIALS AND METHODS : Materials - Equipment - Preparation Methods to Observe Phase Morphology
- RESULTS AND DISCUSSION : Image Analyses - Morphological DevelopmentDOI : 10.3139/217.1780 En ligne : https://drive.google.com/file/d/1wyJ5zIXbkY4E7VZvZLpgAFI4VaeUlDLd/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15821
in INTERNATIONAL POLYMER PROCESSING > Vol. XVIII, N° 4 (12/2003) . - p. 376 - 381[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001026 - Périodique Bibliothèque principale Documentaires Disponible Structure property relationships in PA 6 and PP copolymers blended by single and twin screw extrusion / Carlos A. Correa in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 5 (11/2006)
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Titre : Structure property relationships in PA 6 and PP copolymers blended by single and twin screw extrusion Type de document : texte imprimé Auteurs : Carlos A. Correa, Auteur ; E. Hage, Auteur ; C. A. Razzino, Auteur ; A. L. Bezzan, Auteur ; C. L. Carvalho, Auteur Année de publication : 2006 Article en page(s) : p. 440-448 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Polyamides such as polycaprolactam (PA 6) and poly(hexamethylene adipamide) (PA 6.6), are generally classified as pseudo-ductile materials. Fracture behaviour of PA can be changed by melt compounding with modified olefinic elastomers such as Ethylene-propylene copolymers (EPM and EPDMs) and nitrile rubbers (NBRs). Often, small amounts of a compatibilizer are added to the polymer blend in order to assure good dispersion, morphology stability and consistent enduse properties. Maleated polypropylene (PP-MAH) has been used as compatibilizer in blends of polyamides with polyolefins as they tend to react with amine end groups in the polyamide molecules and also interact by molecular entanglement with non-funcionalized polypropylene chains. This work was intended to optimise stiffness-toughness balance in polyamide/polypropylene blends by reactive processing of PA 6 with polypropylene heterophase copolymers using the PP-MAH as a compatibilizer. Effects of processing conditions on the blend morphology and mechanical properties were investigated by comparing compatibilized and non-compatibilized blends prepared by single and twin screw extrusion. Such approach was intended to investigate whether blend morphology and its response to processing steps can be controlled by blend composition, changes in rheology and interfacial tension during reactive processing. Viscosity measurements by torque rheometry and particle coalescence in-situ observations were performed in order to provide additional evidence of mechanisms relating to phase morphology definition in such systems. DOI : https://doi.org/10.3139/217.0979 En ligne : https://drive.google.com/file/d/1KEfi_fi7Kch4VqJfa9nnX4GwD8m17B9B/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2797
in INTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 5 (11/2006) . - p. 440-448[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 005699 - Périodique Bibliothèque principale Documentaires Disponible