Basalt fiber responds well to the global concept of environmental protection due to its attractive superiorities of green and excellent mechanical performance. However, the ultra-low interfacial adhesion strength of fiber-to-matrix deeply restricts its wide application. Moreover, attempts to utilize natural- or bio-materials on basalt fiber towards growth in interfacial adhesion remains in its infancy, if feasible, it would make green materials shine brilliantly. Herein, we install citric acid modified β-cyclodextrin (β-CD) and polyethyleneimine (PEI) on basalt fiber via dipping approach for the first time, which results in 76.9% increment in fiber-to-epoxy adhesion over control fiber. Unique inner hydrophobic and outer hydrophilic conical cavity architecture of β-CD endows interphase with dense ring hydrogen bond band “core”- covalent/ionic bonding “shell” multiple interactions that balance stress transfer and energy dissipation. Additionally, “rigid” β-CD and “flexible” PEI function as crack deflection and stress distribution for gaining stronger interphase of basalt fiber composites. This paper serves to provide a new exploitation for advancing green and high-performance composites.

中文翻译：

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柠檬酸接枝β-环糊精和聚乙烯亚胺的协同作用改善玄武岩纤维/环氧复合材料的界面性能

玄武岩纤维以其极具吸引力的绿色优势和优异的机械性能，很好地响应了全球的环保理念。然而，纤维与基体之间超低的界面粘合强度严重限制了其广泛应用。此外，利用玄武岩纤维上的天然或生物材料来增强界面粘合力的尝试仍处于起步阶段，如果可行，将使绿色材料大放异彩。在此，我们首次通过浸渍的方法将柠檬酸改性的β-环糊精（β-CD）和聚乙烯亚胺（PEI）安装到玄武岩纤维上，这使得纤维与环氧树脂的粘合力比对照纤维增加了76.9%。 β-CD独特的内疏水外亲水的锥形空腔结构赋予相间密集的环氢键带“核”-共价/离子键“壳”多重相互作用，平衡应力传递和能量耗散。此外，“刚性”β-CD和“柔性”PEI起到裂纹偏转和应力分布的作用，以获得更强的玄武岩纤维复合材料界面。本文旨在为推进绿色高性能复合材料提供新的探索。