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Communication Dans Un Congrès Année : 2023

Modification of Wrapped Flax Rovings with Tannins Molecules for the Development of Fabrics for Composite Applications

Résumé

CONTEXT : Currently, composite materials are made from synthetic reinforcing materials such as glass, carbon and aramid fibers. However, the growing awareness of environmental impact has led to the development of composite materials based on lignocellulosic fibers such as flax. These biocomposites are attractive alternatives due to their low density, excellent specific mechanical properties, low cost, and environmental benefits. However, their use is limited due to their poor thermal and mechanical performance as well as their moisture absorption. Current research focuses on the development of specific surface treatments for lignocellulosic fibers to improve the thermal stability and fiber/matrix interfacial adhesion of the resulting composites. Among the different surface functionalization strategies for plant fibers, chemical treatments are the most used, although only a few of them involve biobased molecules. AIM AND METHODOLOGYThe objective of this study is to chemically modify wrapped flax rovings with biobased molecules such as condensed tannins using a dedicated impregnation line. A comparison was carried out with a non-bio-based molecule widely used for glass fibers and more recently lignocellulosic fibers, namely an aminosilane. Plain and satin fabrics were woven using these treated wrapped rovings with a manual loom device for shaping bioepoxy/flax fabric biocomposites by thermocompression. RESULTS Mid Infrared spectroscopy (FT-IR) analyses allowed to observe the presence of grafted molecules on the surface of the fibers after treatment. The results of the tensile tests of the wrapped flax rovings and of the elaborated flax fabrics showed an increase of the tenacity following the various surface treatments. It was observed that the tensile strength of composite materials stepped up significantly with chemical treatment, due to an increase in interfacial adhesion between the fiber and the matrix, which was proven by scanning electron microscopy (SEM). The porosity of different composites was investigated by X-ray tomography in order to better understand the results obtained. The influence of the weave pattern on the properties of the resulting materials at different scales was also studied.
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Dates et versions

hal-04213695 , version 1 (21-09-2023)

Identifiants

  • HAL Id : hal-04213695 , version 1

Citer

Khouloud TILOUCHE GUERDELLI, Clément Lacoste, Perrin Didier, Pierre Ouagne, Jacopo Tirillò, et al.. Modification of Wrapped Flax Rovings with Tannins Molecules for the Development of Fabrics for Composite Applications. EPNOE 2023 - 8th EPNOE International Polysaccharides Conference, Sep 2023, Graz, Austria. ⟨hal-04213695⟩
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