Silazanes, a novel flax fibers functionalization: Effect on silicone-based composites

• Published in: Composites. Part A, Applied science and manufacturing Vol. 166; p. 107382
• Main Authors: Ishak, Antoine, Sonnier, Rodolphe, Otazaghine, Belkacem, Longuet, Claire
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.03.2023; Elsevier
• Subjects: A. Natural fibers; A. Polymer-matrix composites (PMCs); B. Fibre/matrix bond; B. Interface/interphase; Engineering Sciences; Materials; A. Polymer-matrix composites (PMCs); B. Interface/interphase; B. Fibre/matrix bond; A. Natural fibers; Interface/interphase; Fibre/matrix bond; Polymer-matrix composites (PMCs)
• ISSN: 1359-835X; 1878-5840
• DOI: 10.1016/j.compositesa.2022.107382

[Display omitted] The natural fibers use as reinforcement for composites is a topical subject. Usually, chemical functionalization is used in order to improve the compatibility between natural fibers and polymer matrices, for cross-linkable systems, the grafting agent used for fiber modification can also participate in the three-dimensional network formation and therefore improve the composite mechanical properties. In this study, a silazane: 1,3-divinyltetramethyldisilazane (DVTS) was used for the first time as a flax fibers modification to introduce at their surface vinyl groups, via covalent bonds, that can react during the polysiloxane system cross-linking. The reaction conditions for the flax functionalization were investigated, especially the alkaline pre-treatment impact of the fibers before grafting and the nature of solvent used during the reaction. Scanning electron microscope (SEM) analyses shown a high interfacial adhesion functionalized fibers/matrix. Finally, tensile tests showed a significant increase of composites Young's modulus containing functionalized flax fibers.