Melt compounding of polymeric nanocomposites / L. A. Utracki in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 1 (03/2006)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 1 (03/2006) . - p. 3-16 Titre : Melt compounding of polymeric nanocomposites Type de document : texte imprimé Auteurs : L. A. Utracki, Auteur Année de publication : 2006 Article en page(s) : p. 3-16 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The clay-containing polymeric nanocomposites (CPNC) can be visualized as binary mixtures of strongly interacting, inorganic, plate-like molecules dispersed in a polymeric matrix. To be successful, one must ascertain the thermodynamics, which controls CPNC structure on the molecular level. In this work dispersion of organoclay (Cloisite 15A, C15A) in polyamide 6 (PA 6) or in polypropylene (PP) is discussed. The PAbased CPNC’s contained two components: polymer and organoclay, whereas those based on PP in addition contained a mixture of two maleated polypropylene’s (PP-MA), as a compatibilizer. The melt compounding was carried out either in a single-screw extruder (SSE), or a twin-screw extruder (TSE). Both compounding lines were used with or without the extensional flow mixer (EFM). Furthermore, two versions of EFM were evaluated – one commercial, designed for polymer homogenization and blending, and the other designed for dispersing nano-particles. It was found that addition of EFM significantly improved clay dispersion. Better dispersion was found compounding the CPNC’s in a SSE + EFM than in TSE with or without EFM. The best results were obtained using SSE with the new EFM having a relatively small gap between the convergent-divergent plates. C15A was fully exfoliated in PA 6 matrix. The results in PP/PP-MA matrix were less spectacular, but again the highest degree of dispersion was obtained using SSE + new EFM with a small gap. Tensile, flexural and impact properties were measured and evaluated. DOI : 10.3139/217.0093 En ligne : https://drive.google.com/file/d/1QJomWBkw2TZtlUTmsOOpXPpUoL294ykX/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2924 [article]

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Melt intercalation in montmorillonite/polystyrene nanocomposites / N. Nassar in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 4 (12/2005)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 4 (12/2005) . - p. 423-431 Titre : Melt intercalation in montmorillonite/polystyrene nanocomposites Type de document : texte imprimé Auteurs : N. Nassar, Auteur ; Musa R. Kamal, Auteur ; L. A. Utracki, Auteur Année de publication : 2005 Article en page(s) : p. 423-431 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Atactic polystyrene (PS) was used to study the effect of flow field (shear and/or elongational) on the intercalation of polymer/ clay nanocomposites (PNC). Three grades of (PS), with different molecular weights, were compounded with an ammonium-modified montmorillonite (Cloisite 10A) in a twin-screw extruder (TSE). The compounds were subsequently fed to a single screw extruder, fitted with one of three specially designed torpedo-attachments. The attachments were designed to provide combinations of different levels of shear and elongational deformations. The resins, TSE compounds, and final PNC’s were characterized for the degree of intercalation, degradation, rheological behavior, and mechanical properties. The data showed that the thermal decomposition of the quaternary ammonium intercalant caused severe damage to both PNC components: a collapse of the organoclay interlayer spacing, and the thermo-oxidative degradation of PS. In spite of these detrimental effects, the attachment employing combined elongational and shear flow resulted in generally larger gallery spacing and more improvement of the mechanical properties than the other two attachments. DOI : 10.3139/217.2014 En ligne : https://drive.google.com/file/d/1_gccnSBM9GOQl3-6uqnqApDRXuF4DeKO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2968 [article]

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