Matrix Degradation during High Speed Extrusion of Polypropylene/Clay Nanocomposites – Influence on Filler Dispersion

Guillaume Normand 1 Edith Peuvrel-Disdier 1 Bruno Vergnes 1, *
* Auteur correspondant
1 CEMEF - Centre de Mise en Forme des Matériaux
Abstract : 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.
Keywords : Twin screw extruders Viscosity curve Thermo-mechanical degradation Melt temperature Melt blending Filler dispersion Clay exfoliation Extrusion Nanocomposites Chain scission Blending
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Dernière modification le : jeudi 16 janvier 2020 - 01:15:50

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Guillaume Normand, Edith Peuvrel-Disdier, Bruno Vergnes. Matrix Degradation during High Speed Extrusion of Polypropylene/Clay Nanocomposites – Influence on Filler Dispersion. International Polymer Processing, 2016, 31 (4), pp.508-516. ⟨10.3139/217.3285⟩. ⟨hal-01368846⟩

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