Department of Chemistry, Inha University, 100 Inharo, Incheon 402-751, Korea.
J Nanosci Nanotechnol. 2020 Nov 1;20(11):6760-6767. doi: 10.1166/jnn.2020.18803.
Multiscale hierarchy is a promising chemical approach that provides superior performance in syner-gistically integrated microstructured fibers and nanostructured materials in composite applications. The main purpose of this work was to introduce graphene oxide (GO) between an epoxy matrix and basalt fibers to improve mechanical properties by enhancing interfacial adhesion. The composites were reinforced with various concentrations of GO. For all of the fabricated composites, the optimum GO content was found to be 0.5 wt%, which improved the interlaminar shear strength and fracture toughness by 66.2% and 86.1%, respectively, compared with those of neat composites. We observed a direct linear relationship between fracture toughness and certain surface free energy. In addition, the fracture toughness mechanisms were illustrated using a crack theory based on morphology analyses of fracture surfaces. Such an effort could accelerate the conversion of multi-scale composites into high-performance materials and provide rational guidance and fundamental understanding toward realizing the theoretical limits of mechanical properties.
多尺度层次结构是一种很有前途的化学方法，它在协同集成的微结构纤维和纳米结构材料中提供了卓越的性能，在复合材料应用中具有优异的性能。本工作的主要目的是在环氧树脂基体和玄武岩纤维之间引入氧化石墨烯（GO），通过增强界面附着力来提高力学性能。复合材料中加入了不同浓度的 GO。对于所有制备的复合材料，发现最佳 GO 含量为 0.5wt%，与纯复合材料相比，层间剪切强度和断裂韧性分别提高了 66.2%和 86.1%。我们观察到断裂韧性与某些表面自由能之间存在直接的线性关系。此外，还利用基于断裂表面形貌分析的裂纹理论说明了断裂韧性机制。这种努力可以加速多尺度复合材料向高性能材料的转化，并为实现力学性能的理论极限提供合理的指导和基础理解。
