Effets des nanocharges sur l’amélioration des propriétés du PVC : Elaboration et caractérisation des nanocomposites PVC/Nanocharges (Talc et kaolin)

Abstract

Rigid PVC has some disadvantages such as poor mechanical properties, low thermal stability and difficult processing. In order to improve its properties, the present study aims to develop a PVC-based composite using a combination of talc and calcined kaolin as filler. For comparison, PVC/talc and PVC/calcined kaolin composites have also been prepared and studied. The calcined kaolin was modified with urea to increase its surface area by intercalation/delamination (chemical treatment), while the surface of both fillers was coated with stearic acid for good compatibility with PVC (mechanical treatment). The composites were prepared by melt mixing using a Brabender plastograph. From the Brabender couple, a reduction in viscosity and melt time was detected by adding the treated fillers, thus ensuring improved processability of the rigid PVC composites. The results showed that the surface treatments promote the dispersion of talc and calcined kaolin particles uniformly in the PVC matrix and proved the improvement of thermal stability and mechanical properties of rigid PVC. Binary filler-based composites combined the good properties of both (synergism).