Comportement viscoélastique lors du moulage par injection de composites polypropylène-fibres de verre courtes

Viscoelastic behaviour of injection molded polypropylene / short glass fibers composites

Département Génie Mécanique, Matériaux et Énergétique, Conservatoire National des Arts et Métiers, Paris

Abstract

Our work deals with the viscoelastic behavior and the evolution of the morphology of polypropylene samples reinforced with short glass fibers and molded with an injection machine. The influences on polymer properties of the mold temperature, of the rate of fibers and of the embedding are studied. We determine the existence of typical relations between the microstructure, the thermomechanical parameters of the injection and the viscoelastic properties of the composite. All these results contribute to optimize the mechanical resistance of molded objects thanks to a better knowledge of the action of injection molding parameters.