Élaboration et caractérisations des composites hybrides PEHD/fibres PET recyclés/montmorillonite organophile : étude des effets de la composition et du traitement de surface de la fibre PET

Abstract

The work exposed in this memory concerns the development and the characterization of hybrid composite systems high density polyethylene/PET fiber/ organophilic montmorillonite (HDPE/ PET fiber /OMMT) to various percentages of untreated and surface treated fiber and montmorillonite. The study has focused, essentially, on the investigation of the effects of PET fiber and montmorillonite rates and of the fiber surface treatment by mercerization on the structural, mechanical, thermal and rheological properties of the composites. The analysis of the elaborated hybrid composites by X-ray diffraction (XRD) showed that the inter-lamellate distances and the crystal size of HDPE are not influenced by the addition of the reinforcements independently of their concentrations in the hybrid composite. Also, the results of the mechanical properties study revealed that the composites behavior at break is principally governed by the PET fiber rate and that the effect of the surface treatment is relatively slight. The results of the thermal analysis by the differential scanning calorimetry (DSC) showed a reduction of HDPE crystallinity with the addition of PET fiber and montmorillonite. Finally, it was found that the surface treatment of PET fiber does not affect the thermal stability of the HDPE matrix.