At IRDL, Ismahen Zaafouri explored PHA-based biocomposites reinforced with Alfa fibers.
Ismahen Zaafouri, chercheur·e au sein de IRDL (Institut National Polytechnique de Bretagne).
Thèse soutenue en 2024 à l'école doctorale École doctorale Sciences Pour l'Ingénieur (Lorient ; 2022-....).
Référencée dans le réseau ABES/STAR, cette thèse répond aux critères de rigueur de l'enseignement supérieur français.
Research on biocomposites is rapidly expanding, and the study conducted by Ismahen Zaafouri at IRDL highlights a promising material: polyhydroxyalkanoates (PHA) reinforced with Alfa fibers. These materials, derived from renewable resources, offer a sustainable alternative to traditional plastics, which are often petroleum-based. By experimentally characterizing and numerically simulating the mechanical behavior of these biocomposites, this thesis paves the way for various industrial applications, ranging from packaging to automotive.
PHAs, which are biodegradable polymers, are produced by microorganisms from sugars or vegetable oils. Their ability to decompose naturally in the environment makes them a preferred solution in the face of the plastic pollution crisis. By integrating Alfa fibers, a local and abundant plant in West Africa, Zaafouri's research not only proposes an alternative material but also values local resources, thereby contributing to a circular economy.
The results of this research are significant. On one hand, they allow for the identification of mechanical behavior models suitable for biocomposites, which is essential for their integration into concrete applications. For example, the tensile strength and flexibility of reinforced PHAs can be optimized for specific uses, such as in the manufacture of lightweight automotive parts or biodegradable packaging. On the other hand, the evaluation of the mechanical and thermal properties of reinforced PHAs demonstrates their potential to replace less durable materials, such as single-use plastics. The importance of promoting these sustainable alternatives is all the more crucial in a context where plastic pollution has become a major environmental issue.
However, several challenges remain. The complexity of recycling traditional composite materials and the need to optimize the extraction and processing of natural fibers are scientific barriers to overcome. For example, the extraction process of Alfa fibers must be refined to ensure optimal quality without compromising the integrity of the fibers. Research must therefore continue to improve the adhesion between Alfa fibers and the PHA matrix, as well as to refine the developed mathematical models. Furthermore, the economic impact of these materials could be considerable, both for fiber producers and for industries seeking to reduce their ecological footprint.
It is therefore imperative that policymakers and investors take these advancements into account. The rise of biocomposites could not only contribute to a greener economy but also create job opportunities in the agriculture and materials processing sectors. By supporting research and development in this field, we could see the emergence of a new generation of materials that combine performance and sustainability, thus meeting the growing needs of a society concerned about its environmental impact.
In West Africa, where the cultivation of Alfa is already well established, this research could also stimulate local initiatives. For example, agricultural cooperatives could form around the cultivation of Alfa, providing additional income to farmers while meeting a growing demand for sustainable materials. Moreover, local industries could benefit from innovation in biocomposites by integrating these new materials into their production processes.
In conclusion, Ismahen Zaafouri's thesis represents a significant advancement in the field of biocomposites. It opens promising perspectives for the future of sustainable materials while highlighting the importance of research and innovation in the fight against plastic pollution. By fostering an integrated approach that combines scientific research, economic development, and environmental sustainability, we can hope to see the emergence of a new era of materials that address contemporary challenges.
Accéder à l'étude complète
Sources et accès
Ismahen Zaafouri. Caractérisation expérimentale et simulation numérique du comportement mécanique de PHA renforcé en fibres d’Alfa. Matériaux. Université de Bretagne Sud; Université de Monastir (Tunisie), 2024. Français. ⟨NNT : 2024LORIS688⟩. ⟨tel-04927143⟩