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Attempts to Optimize the Dispersion State during Twin-Screw Extrusion of Polypropylene/Clay Nanocomposites

Abstract : 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.
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https://hal-mines-paristech.archives-ouvertes.fr/hal-01497324
Contributor : Magalie Prudon <>
Submitted on : Tuesday, March 28, 2017 - 3:26:06 PM
Last modification on : Thursday, September 24, 2020 - 5:22:57 PM

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Guillaume Normand, Edith Peuvrel-Disdier, Bruno Vergnes. Attempts to Optimize the Dispersion State during Twin-Screw Extrusion of Polypropylene/Clay Nanocomposites. International Polymer Processing, 2017, 32 (1), pp.129 - 137. ⟨10.3139/217.3318⟩. ⟨hal-01497324⟩

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