Importance of fiber preparation to optimize the surface and mechanical properties of unitary flax fiber
Résumé
Plant fibers have several aspects, such as low energetic production costs, biodegradability and great mechanicalproperties, which make them very attractive in the field of composite reinforcement. The aim of this study was to compare the impact of two eco friendly water washings on the thermal behavior, surface morphology and mechanicalproperties of flaxfibers (Electra variety). As a first step, we have carried out scanning electronic microscopy (SEM) to evaluate surfaceproperties and performed thermogravimetric analysis (TGA) to estimate the effects of the treatments on the fiber composition. Secondly, tensile tests were performed on elementary fibers. The results show no negative impact of water treatment on the mechanicalproperties of the elementary fibers. Moreover, after water washing for 72 h at 23 °C, the Young's modulus values appeared to increase slightly, possibly due to better surface state and an easier extraction of flaxfibers. Finally, an analysis of eluted sugars suggests some negative effect of the boiling treatment on the fiber structure.