Abstract The mechanical properties of carbon fiber (CF) reinforced composites are greatly dependent on the interfacial adhesion between fiber and resin matrix. Introducing nanoscale reinforcements into the interface is an effective approach to improve the interfacial adhesion of CF composites. In this paper, we proposed a facile and effective method for assembling poly(cyclotriphosphazene-co-4,4′-sulfonyldiphonel) nanotube onto CF surface as a novel multi-scale hybrid reinforcement through in situ template polymerization. The effects of surface modification on the surface and interface properties of CF and the resulting composite were investigated. After modification, the interfacial shear strength of fiber reinforced epoxy composites showed an increase of 26.4%. The reinforcing mechanisms were also analyzed, and the improvements on interfacial properties should mainly be attributed to mechanical interlocking effect. In addition, the modification even improved the fiber tensile strength by 6.6–16.3%, rather than deteriorating it.

中文翻译：

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聚磷腈纳米管/碳纤维多尺度混合增强材料的新型简便制备及其对环氧复合材料界面性能的增强作用

摘要 碳纤维（CF）增强复合材料的力学性能在很大程度上取决于纤维与树脂基体之间的界面附着力。将纳米级增强材料引入界面是提高 CF 复合材料界面附着力的有效方法。在本文中，我们提出了一种简便有效的方法，通过原位模板聚合将聚（环三磷腈-co-4,4'-磺酰二苯基）纳米管组装到 CF 表面作为一种新型的多尺度混合增强材料。研究了表面改性对 CF 和所得复合材料的表面和界面性质的影响。改性后，纤维增强环氧树脂复合材料的界面剪切强度提高了26.4%。还分析了强化机制，界面性能的改善主要归功于机械联锁效应。此外，该改性甚至将纤维拉伸强度提高了 6.6-16.3%，而不是使其恶化。