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Surface modification of sized vegetal fibers through direct fluorination for eco-composites

Abstract : Natural fibers are frequently used as alternatives of glass fibers as polymer matrix reinforcement to form composite materials. However, their natural hydrophilicity prevents them from being easily compatible with hydrophobic polymers, which represent the majority of matrices. To solve this, direct fluorination of sized natural fibers (flax fibers sized with DGEBA) was performed. EDX, FTIR and 19F NMR analysis evidenced the chemical grafting of fluorine on DGEBA structure and the ablation of the oxiranes rings on this molecule. Chemical modifications of DGEBA have induced a hydrophobic character of this layer, by reducing at 0 the polar component of surface tension. Thereby, treated fibers are supposed to be perfectly chemically compatible with the hydrophobic polymer matrices (e.g. polypropylene). Additionally, the fluorination time also allows the dispersive component of surface tension and the rugosity of fibers to be tailored in order to perfectly adjust these characteristics and fit with the polymer. Moreover, this chemical modification was achieved without altering the mechanical properties of fibers for short fluorination times.
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Submitted on : Friday, November 27, 2020 - 4:05:29 PM
Last modification on : Tuesday, April 26, 2022 - 3:40:38 AM
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Olivier Teraube, Jean-Charles Agopian, Elodie Petit, François Metz, Nicolas Batisse, et al.. Surface modification of sized vegetal fibers through direct fluorination for eco-composites. Journal of Fluorine Chemistry, Elsevier, 2020, 238, pp.109618. ⟨10.1016/j.jfluchem.2020.109618⟩. ⟨hal-03026071⟩



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