International Research Center for Advanced Structural and Biomaterials, School of Materials Science and Engineering, Beihang University, Beijing, 100191, China.
Beijing Advanced Innovation Center for Biomedical Engineering, Beijing, 100083, China.
Nat Commun. 2019 Aug 22;10(1):3786. doi: 10.1038/s41467-019-11520-2.
High stiffness and strength carbon fibres are commonly used to reinforce epoxy-resin composites. While wild Antheraea pernyi silk fibres exhibit high toughness originating from their α-helix/random coil conformation structures and their micro-fibre morphology, their insufficient strength and stiffness hinders them from being used in similar structural composites. In this work, we use interply hybridization of silk and carbon fibres to reinforce epoxy-matrix composites. With increased carbon fibre content, the quasi-static tensile/flexural stiffness and strength increases following the rule of mixtures while more silk fibre acts to increase ductility and impact strength. This results in a composite comprising equal volumes of carbon and silk fibres achieving an impact strength of 98 kJ m, which is twice that of purely carbon-fibre reinforced composites (44 kJ m). This work shows tough natural silk fibres and strong synthetic fibres can be successfully integrated into epoxy-resin composites for tailored mechanical properties.
高刚性和高强度碳纤维通常用于增强环氧树脂复合材料。虽然野生柞蚕丝纤维由于其α-螺旋/无规卷曲构象结构和微纤维形态表现出高韧性，但它们的强度和刚性不足，限制了它们在类似结构复合材料中的应用。在这项工作中，我们使用丝纤维和碳纤维的层间杂交来增强环氧树脂基复合材料。随着碳纤维含量的增加，准静态拉伸/弯曲刚度和强度按照混合物的规律增加，而更多的丝纤维则增加了延性和冲击强度。这导致包含等量碳纤维和丝纤维的复合材料的冲击强度达到 98kJ/m，是纯碳纤维增强复合材料（44kJ/m）的两倍。这项工作表明，坚韧的天然丝纤维和高强度的合成纤维可以成功地整合到环氧树脂复合材料中，以获得定制的机械性能。
