Graphene nanoplatelets (GNPs)/silane-coupling-agent-treated GNPs (KH- GNPs) and hydroxyl multi-walled carbon nanotubes (MWCNTs-OH) were added as reinforcing agents to an epoxy matrix, diglycidylether of bisphenol-A (DGEBA), to improve the fracture toughness of DGEBA. The influence of the MWCNT-OH fraction on the thermal and flexural properties, fracture toughness, and morphology of the DGEBA/GNP/MWCNT-OH and DGEBA/KH-GNP/MWCNT-OH nanocomposites was investigated. The results indicate that the fracture toughness of the DGEBA/KH-GNP/MWCNT-OH nanocomposites increased from 1.09 to 1.46MPa·m 1/2 , which is 33.9% greater than that of pristine DGEBA. Analysis of the fracture surfaces of the nanocomposites showed a rough morphology with numerous tortuous and river-like structures. In addition, the MWCNTs-OH were slightly pulled out or broken in the epoxy matrix during the fracture toughness tests.

中文翻译：

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石墨烯纳米片和碳纳米管增强环氧树脂的断裂韧性增强

将石墨烯纳米片（GNPs）/硅烷偶联剂处理的 GNPs（KH-GNPs）和羟基多壁碳纳米管（MWCNTs-OH）作为增强剂添加到环氧树脂基质中，双酚 A 的二缩水甘油醚（DGEBA），以提高 DGEBA 的断裂韧性。研究了 MWCNT-OH 分数对 DGEBA/GNP/MWCNT-OH 和 DGEBA/KH-GNP/MWCNT-OH 纳米复合材料的热和弯曲性能、断裂韧性和形态的影响。结果表明，DGEBA/KH-GNP/MWCNT-OH纳米复合材料的断裂韧性从1.09提高到1.46MPa·m 1/2 ，比原始DGEBA提高了33.9%。对纳米复合材料断裂面的分析显示出具有许多曲折和河流状结构的粗糙形态。此外，