The interfacial properties between carbon fiber (CF) and polymer matrix are critical to the performance of CF reinforced composites. Herein, we reported a new method of tailoring the interfacial properties by grafting graphene oxide (GO) onto the CF surface with hyperbranched polyglycerol (HPG), which could improve the interfacial shear strength (IFSS) and heat resistance of CF/PA6 and CF/epoxy (EP) composites. A large number of hydroxyl groups were introduced onto CF surface by using HPG as a new coupling agent, which improved the grafting amount of GO, the polarity, wettability and surface energy of CF. The IFSS of composites at different temperature was investigated by microbond test. The results showed that after introducing GO into the interface, the IFSS of CF reinforced PA6 and epoxy composites increased by 44% and more than 30%, respectively. Moreover, the IFSS of GO modified CF/EP1 composites at 85°C was only 9.1% lower than that at 25°C. In addition, the IFSS of the CF/PA6 and CF/EP2 composites could be kept stable when the ambient temperature was lower than the melting point or glass transition temperature of the resin matrix. Finally, the interfacial enhancement mechanism was further analyzed in details.

中文翻译：

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通过用超支化聚甘油将氧化石墨烯接枝到碳纤维表面来提高 CF/PA6 和 CF/环氧树脂复合材料的界面剪切强度

碳纤维 (CF) 和聚合物基体之间的界面特性对 CF 增强复合材料的性能至关重要。在此，我们报道了一种通过用超支化聚甘油 (HPG) 将氧化石墨烯 (GO) 接枝到 CF 表面来定制界面性质的新方法，该方法可以提高 CF/PA6 和 CF/的界面剪切强度 (IFSS) 和耐热性。环氧树脂（EP）复合材料。以HPG为新型偶联剂，在CF表面引入了大量羟基，提高了GO的接枝量，提高​​了CF的极性、润湿性和表面能。通过微粘结试验研究了复合材料在不同温度下的IFSS。结果表明，在界面中引入GO后，CF增强PA6和环氧树脂复合材料的IFSS分别提高了44%和30%以上，分别。此外，GO 改性 CF/EP1 复合材料在 85°C 时的 IFSS 仅比 25°C 时低 9.1%。此外，当环境温度低于树脂基体的熔点或玻璃化转变温度时，CF/PA6和CF/EP2复合材料的IFSS可以保持稳定。最后，进一步详细分析了界面增强机制。