Attemps to optimize the dispersion state during twin-screw extrusion of polypropylene/clay nanocomposites / G. Normand in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 1 (03/2017)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 1 (03/2017) . - p. 129-137 Titre : Attemps to optimize the dispersion state during twin-screw extrusion of polypropylene/clay nanocomposites Type de document : texte imprimé Auteurs : G. Normand, Auteur ; Edith Peuvrel-Disdier, Auteur ; Bruno Vergnes, Auteur Année de publication : 2017 Article en page(s) : p. 129-137 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Anhydride maléique Argile Composites -- Extrusion Diffractométrie de rayons X Dispersions et suspensions Etat fondu (matériaux) Nanoparticules Polypropylène Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : Polypropylene/organoclay nanocomposites were prepared by melt-mixing in a twin-screw extruder. Polypropylene grafted with maleic anhydride was used as compatibilizer. The evolution of the microstructure along the screw profile was characterized through dead-stop experiments. In order to quantify the multi-scale dispersion state of the nanocomposites, different techniques have been used: scanning electronic microscopy (SEM) to observe the large remaining aggregates, X-Ray diffraction measurements to characterize the intercalation state by measuring the interlamellar distance, and finally rheological characterizations in the molten state to assess the dispersion state at the nanoscale. The effects of low barrel temperatures and high matrix viscosity were tested, in order to improve exfoliation by an increase in shear stresses. Note de contenu : - MATERIALS AND METHODS : Materials - Twin-screw extrusion - Characterization - RESULTS AND DISCUSSION : Evolution of the dispersion state along the screws - Effect of a low barrel temperature - Effect of a high viscosity matrix - Interpretation DOI : 10.3139/217.3318 En ligne : https://drive.google.com/file/d/1i-4ZYBKF_WuluOWvtuIHqGd_2OioNa_d/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28009 [article]

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Matrix degradation during high speed extrusion of polypropylene/clay nanocomposites - Influence on filler dispersion / G. Normand in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 4 (08/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 4 (08/2016) . - p. 508-516 Titre : Matrix degradation during high speed extrusion of polypropylene/clay nanocomposites - Influence on filler dispersion Type de document : texte imprimé Auteurs : G. Normand, Auteur ; Edith Peuvrel-Disdier, Auteur ; Bruno Vergnes, Auteur Année de publication : 2016 Article en page(s) : p. 508-516 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile Charges (matériaux) Dispersions et suspensions Matériaux hybrides -- Extrusion Matières plastiques -- Extrusion:Polymères -- Extrusion Nanoparticules Polymères -- Détérioration Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : We prepared polypropylene/organoclay nanocomposites by melt blending in a twin-screw extruder, exploring the domain of high screw speeds (up to 1 100 min?1). The samples were characterized at both microscale (size of agglomerates) and nanoscale (level of exfoliation). We show that, despite a satisfactory exfoliation, the polymer matrix suffered important thermomechanical degradation by chain scission. We propose a way to correct this degradation on the viscosity curves and we confirm that high screw speeds are not necessarily favorable to clay exfoliation, essentially because of the too high melt temperatures encountered during the process. Note de contenu : - MATERIALS AND METHODS : Materials - Samples preparation - Microstructure characterization - RESULTS AND DISCUSSION : Microscopic observations - Intercalation state - Rheological measurements - Discussion DOI : 10.3139/217.3285 En ligne : https://drive.google.com/file/d/1oiJO8tHdDad7-8AcSzOTym9g7yhX0xee/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26813 [article]

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