Title: Influence of loading rates on morpholgy and mechanical properties of PLA/clay nanocomposites

Authors: Mustapha Kaci; Lynda Zaidi; Stéphane Bruzaud; Alain Bourmaud; Pascal Médéric; Yves Grohens

Addresses: Laboratory of Organic Materials, Department of Engineering Processes, Faculty of Technology, University Abderrahmane Mira, Route de Targa-Ouzemmour, Bejaia 06000, Algeria. ' Laboratory of Organic Materials, Department of Engineering Processes, Faculty of Technology, University Abderrahmane Mira, Route de Targa-Ouzemmour, Bejaia 06000, Algeria. ' Laboratoire d'Ingénierie des Matériaux de Bretagne, Université de Bretagne Sud, 56321 Lorient Cedex, France. ' Laboratoire d'Ingénierie des Matériaux de Bretagne, Université de Bretagne Sud, 56321 Lorient Cedex, France. ' Laboratoire d'Ingénierie des Matériaux de Bretagne, Université de Bretagne Sud, 56321 Lorient Cedex, France. ' Laboratoire d'Ingénierie des Matériaux de Bretagne, Université de Bretagne Sud, 56321 Lorient Cedex, France

Abstract: This paper reports some experimental results on the influence of loading rates on morphology and mechanical properties of clay nanocomposites based on polylactide (PLA). The dispersed phase was organically modified montmorillonite commercially known as Cloisite 30B and introduced at various loading rates: 1, 3 and 5 wt.%. The nanocomposites were prepared by melt intercalation in a Brabender Plasticorder mixer. Wide angle X-ray scattering showed that the clay was finely distributed in the PLA matrix and the nanocomposite morphology can be considered as intercalated/exfoliated structure, whatever the filler content. The effect of clay loadings on the mechanical properties of PLA/organoclay was investigated by nanoindentation and tensile measurements. Nanoindentation results showed a significant improvement in modulus and hardness with increase of the clay contents. This is consistent with the large increase in Young's modulus obtained by tensile tests indicating a good correlation of mechanical properties at the macrometric and nanometric scales.

Keywords: polylactide; PLA; clay nanocomposites; melt intercalation; morphology; mechanical properties; wide angle X-ray scattering; nanoindentation; nanotechnology; modulus; hardness; tensile tests.

DOI: 10.1504/IJMMP.2012.050942

International Journal of Microstructure and Materials Properties, 2012 Vol.7 No.5, pp.390 - 399

Published online: 10 Dec 2012 *

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