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Contribution à l'amélioration de la compatiblilité interfaciale fibres naturelles/matrice thermoplastique via un traitement sous décharge couronne

Abstract : The field of composites materials shows increasing use of biodegradable matrices and / or natural reinforcements from renewable resources. Nevertheless, a compatibilization step between fiber and matrix is necessary. In this PhD study, we have explored a physical method: corona treatment. Its impact on the physicochemical properties of different fibres has been studied by XPS, contact angle measurement and SEM. It appears that it mainly involves surface oxidation and roughness increase. We have also evaluated the mechanical behaviour of composites, prepared by extrusion from hemp or miscanthus fibres and polypropylene (PP) or polylactic acid (PLA) matrices. The incorporation of raw reinforcements increases the stiffness and the stress transfer. Composites based on treated fibres show better mechanical performances, resulting from an enhanced mechanical anchorage. The optimum values are obtained for 20% (wt) fibres content. The thermal and thermomechanical properties of composites have been characterized by TGA, DMA and DSC. The thermal stability of materials is reduced after incorporation of raw reinforcements but very much improved (+ 15 - 20 ° C) after treatment of fibres. Under certain conditions, the fibres act as nucleating agents that affect the crystallization process and crystallinity rate. The corona treatment of fibres does not delay the degradation of materials during an accelerated aging in humid environment and the evolution of the thermomechanical properties is more pronounced for PLA based materials because of its hydrophilic character.
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Mohamed Ragoubi. Contribution à l'amélioration de la compatiblilité interfaciale fibres naturelles/matrice thermoplastique via un traitement sous décharge couronne. Autre. Université Henri Poincaré - Nancy 1, 2010. Français. ⟨NNT : 2010NAN10135⟩. ⟨tel-01746392⟩

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