Effet du traitement thermique et l'epaisseur sur les proprietes mecaniques et physiques du composite polystyrene pigmente par le dioxyde de titane

Abstract

The mechanical properties of the compositepolystyrene-titania (PS/TiO2)can beimprovedby stresses. Temperinggeneratescompressive surfacestress, which leads to strengthening. The study ofmechanical and thermal behaviorof the composite PS/TiO2temperedaims toestablish relationships betweenthese properties andthe quenching temperature. The compositePS/TiO2is recognized asa hard and a brittle thermoplastic polymer. It was observedthat thehardeningcarried out at definedtemperatures,residual stressrelaxationmode ofthe polymer producedatransition toductilebehaviorof residual stressesresulting inthe increase inimpact strength, elongation at breakand lower elasticmodulus, and density. The quenching method is a simple and effective way to generate thermal stresses in the composite PS/TiO2. This process leads to structural changes and mechanical reinforcement. In this case, quenching is only effective for thicknesses above 1 mm. The presence of compressive residual stresses prevents the diffusion of methanol.