. . . . . . . . . .    ANM 2010     3rd International Conference on Advanced Nano Materials     12-15 September 2010 - Agadir, Morocco Back    Abstract ANMM350 POLYPROPYLENE BASED ORGANOCLAY NANOCOMPOSITES: STIFFNESS AND YIELD STRESS PREDICTIONS  K. Wang 1, R. Matadi 1, N. Balhouli 1, S. Ahzi 1,3, Y. Remond 1, M. Bouquey 2, R. Muller 2 1 IMFS, Université de Strasbourg, 2 rue Boussingault, 67000 Strasbourg, France 2 ECPM-LIPHT, Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg, Cedex 2, France 3 TEMA, University of Aveiro, 3810-193 Aveiro, Portugal . The nanocomposites were obtained by mixing the polypropylene matrix with a master bach of polypropylene modified anhydrid maleic and montmorillonite organoclay (pp-nanocor). Thermomechanical tests including compression tests and dynamic mechanical analysis (DMA) were used to evaluate the organoclay effect on the Young’s modulus, yield stress and storage modulus. A statistical model is used to describe the stiffness variation of the obtained nanocomposites over a wide range of temperatures and frequencie. In addition, a micromechanically based formulation of the cooperative model for the yield behavior of  the organoclay nanocomposites is proposed. The mechanical properties obtained from the compression tests show an increase in the Young’s modulus, storage modulus, and yield stress as function of the organoclay concentrations. Experimental results also show that the yield stress and modulus of the organoclay nanocomposites are very sensitive to the organoclay concentration, strain rate and temperature. The results obtained from the models are in good agreement with our experimental results. . © nanoAC . . . . . . . . . .

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