Doctoral Dissertations

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Browsing Doctoral Dissertations by Subject "fiber extraction"

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    Exploitation des fibres végétales sur les sites de Boussaâda comme élément de renforcement des matériaux composites
    (University of M'Sila, 2025-02-27) MEDDAH Mostefa
    This thesis explores the use of plant fibers as reinforcements for composite materials, an approach driven by the search for sustainable and environmentally friendly solutions. Plant fibers offer several significant advantages, such as low cost, considerable lightness, and a high specific modulus, making them particularly attractive for various industrial applications. Our work specifically focuses on the characterization of two fibers, Malva sylvestris L. and Typha angustifolia, available in the Boussaâda region (Algeria), as potential reinforcements for polymer-based composites. The adopted methodology includes a thorough analysis of the physical, chemical, and mechanical properties of these fibers. It is important to highlight that this is the first time that Malva sylvestris L. fiber has been characterized as a lignocellulosic fiber for reinforcing composite materials or for textile applications. Both types of fibers (Malva sylvestris L. and Typha angustifolia) are used as reinforcement elements for polyester resin-based composites. These composites, obtained by vacuum molding, are analyzed using ATR-FTIR spectroscopy and then characterized by mechanical tests (tensile and three-point bending tests). Their mechanical performance is compared to that of the virgin resin. This comparison highlighted the effect of adding plant fibers on the mechanical behavior of the composites. This work contributes to the development of low environmental impact composite materials, tailored to meet the performance and durability requirements in various industrial sectors.