The high stiffness and damping properties of flax fibres promote the integration of biocomposites in structural applications. However, the strength of flax/epoxy composites is still limited compared to glass/epoxy composites. Graphene oxide (GO) has proved to be a promising building block for nanocomposites due to its high toughness, stiffness and tunable interfacial interactions with polymers. This study aims to understand the potential of GO-based surface treatment of flax fibres to modify the interfacial adhesion and tensile performance of flax fibre/epoxy composites. GO-modification improves the interfacial shear strength of elementary flax fibre/epoxy by 43%. The interfacial improvement is also established by the 40% higher transverse bending strength compared to untreated flax/epoxy composites. The tensile moduli of GO-modified flax/epoxy composites are on average 2 GPa higher than for untreated flax fibre/epoxy composites in all strain ranges. The quasi-static longitudinal tensile strength of unidirectional composites is not affected by GO-modification.

亚麻纤维的高刚度和阻尼特性促进了生物复合材料在结构应用中的整合。但是，与玻璃/环氧树脂复合材料相比，亚麻/环氧树脂复合材料的强度仍然受到限制。氧化石墨烯（GO）由于其高韧性，刚度以及与聚合物的可调节界面相互作用，已被证明是纳米复合材料的有前途的组成部分。这项研究旨在了解亚麻纤维基于GO的表面处理潜力，以改变亚麻纤维/环氧树脂复合材料的界面粘合性和拉伸性能。GO改性将基本亚麻纤维/环氧树脂的界面剪切强度提高了43％。与未处理的亚麻/环氧树脂复合材料相比，横向弯曲强度高40％，也可以改善界面。在所有应变范围内，GO改性亚麻/环氧树脂复合材料的拉伸模量平均比未处理的亚麻纤维/环氧树脂复合材料高2 GPa。单向复合材料的准静态纵向拉伸强度不受GO改性的影响。