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Licensed Unlicensed Requires Authentication Published by De Gruyter July 21, 2016

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

  • G. Normand , E. Peuvrel-Disdier and B. Vergnes


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.

*Correspondence address, Mail address: Bruno Vergnes, MINES ParisTech, PSL Research University, CEMEF – Centre de Mise en Forme des Matériaux, UMR CNRS 7635, CS 10207, 06904 Sophia-Antipolis, France. E-mail:


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Received: 2016-03-29
Accepted: 2016-05-06
Published Online: 2016-07-21
Published in Print: 2016-08-12

© 2016, Carl Hanser Verlag, Munich

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