Performance des melanges polypropylene/talc/polyethylene-octen

The addition of filler in polymer modifies physical and mechanical properties like stiffness and combustibility. The filler increases the stiffness but decreases impact resistance. Studies show that introducing fine talc particles reduces those losses. In this work, the studied blend is a matrix of polypropylene in which we add talc and a coupling agent.;The main objectives are: study of the effect of operating conditions on blend properties; study of the effect of composition of blend and verification if the interaction between the filler and coupling agent is physical or chemical.;First, the study of operating conditions demonstrates that flow rate, rotation speed and temperature don't have any relevant influence on the mechanical properties in traction and impact properties of the blend.;Second, in the study of the effect of the composition of the blend, the concentration of the components is varied. The addition of 30% by weight of talc doubles the tensile modulus. A significant increase of impact resistance is obtained with the addition of 20% of EO. Adding a coupling agent increases the yield stress. The optimal composition of coupling agent is 1--2%. At higher compositions, the coupling agent who has a low molecular weight dilutes the matrix and reduces tensile modulus.;The polypropylene grafted with the glycedyl of methacrylate (PP-GMA) gives a superior increase in mechanical properties than the polypropylene grafted with maleic anhydride (PP-MAH). The improvement in mechanical properties is attributed to a polar attraction between the coupling agent and the talc. (Abstract shortened by UMI.).