Experimental study and micromechanical modeling of MMT platelet-reinforced PP nanocomposites

Ludovic Cauvin; Naresh Bhatnagar; Mathias Brieu; Djimédo Kondo

doi:10.1016/j.crme.2007.07.007

Experimental study and micromechanical modeling of MMT platelet-reinforced PP nanocomposites

Presented by: Évariste Sanchez-Palencia

Ludovic Cauvin ¹; Naresh Bhatnagar ²; Mathias Brieu ¹; Djimédo Kondo ¹

¹ Laboratoire de mécanique de Lille, UMR CNRS 8107, boulevard Paul-Langevin, 59655 Villeneuve d'Ascq cedex, France
² Mechanical Engineering Department, Indian Institute of Technology, HausKhaz, New Delhi, India

Comptes Rendus. Mécanique, Volume 335 (2007) no. 11, pp. 702-707.

Abstract
Résumé

Nanocomposites with platelets reinforcements are emerging materials with strong potential for future engineering applications. The present study is a first step to characterize and predict the elastic behavior of Montmorillonite (MMT) clay reinforced Polypropylene (PP) nanocomposites. The pellets of nanoclay composites were made by first uniformly mixing the MMT platelets in a twin-screw extruder by the melt intercalation route. These pellets were then converted into tensile specimens as per ASTM 638 by injection molding process. From tensile tests it is shown that there is a significant increase of the Young modulus with the mass fraction (2–7%) of clay platelets. A first approach of homogenization allows to conclude that the Ponte Castañeda and Willis (1995) bound predicts the measured moduli provided that a suitable aspect ratio of the reinforcement is considered.

Les nanocomposites à renforts plaquettaires sont des matériaux émergents à fort potentiel. Cette étude est une première étape de caractérisation et de prédiction du comportement élastique de nanocomposites à matrice Polypropylène (PP) renforcée par des nanoplaquettes d'argile de Montmorillonite (MMT). Les granules du nanocomposite ont été préalablement réalisés en mélangeant de manière uniforme les plaquettes de MMT à la matrice dans une extrudeuse à double vis sans fin. Des éprouvettes de traction, conformes à la norme ASTM 638, ont ensuite réalisées à partir de ces granules à l'aide d'un procédé de moulage par injection puis testées en traction uniaxiale. Les modules d'Young, déduits de ces essais, montrent une augmentation significative avec la fraction massique ( $2 – 7 %$ ) des nanoplaquettes. Une première approche de modélisation micromécanique permet de montrer que la borne de Ponte Castañeda et Willis (1995) prédit ces modules à condition de considérer un rapport d'aspect adéquat pour les plaquettes.

Received: 2007-06-18
Accepted: 2007-07-27
Published online: 2007-08-30

DOI: 10.1016/j.crme.2007.07.007

Keywords: Solids and structures, Nanocomposites, Experimental study, Effective moduli, Homogenization
Mot clés : Solides et structures, Nanocomposites, Étude expérimentale, Modules effectifs, Homogénéisation

Author's affiliations:

Ludovic Cauvin ¹; Naresh Bhatnagar ²; Mathias Brieu ¹; Djimédo Kondo ¹

¹ Laboratoire de mécanique de Lille, UMR CNRS 8107, boulevard Paul-Langevin, 59655 Villeneuve d'Ascq cedex, France
² Mechanical Engineering Department, Indian Institute of Technology, HausKhaz, New Delhi, India

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     title = {Experimental study and micromechanical modeling of {MMT} platelet-reinforced {PP} nanocomposites},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {702--707},
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Ludovic Cauvin; Naresh Bhatnagar; Mathias Brieu; Djimédo Kondo. Experimental study and micromechanical modeling of MMT platelet-reinforced PP nanocomposites. Comptes Rendus. Mécanique, Volume 335 (2007) no. 11, pp. 702-707. doi : 10.1016/j.crme.2007.07.007. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2007.07.007/

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