Improving the interfacial properties of carbon fiber–epoxy resin composites with a graphene‐modified sizing agent
Improving the interfacial properties of carbon fiber–epoxy resin composites with a graphene‐modified sizing agent
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DOI：
10.1002/app.47122
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发表时间：
2018-10
影响因子：
3
通讯作者：
Ling-cong Li;Chun Yan;Haibing Xu;Dong Liu;Pengcheng Shi;Yingdan Zhu;Gang Chen;Xiaofei Wu;Wenqing Liu
中科院分区：
文献类型：
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作者：
Ling-cong Li;Chun Yan;Haibing Xu;Dong Liu;Pengcheng Shi;Yingdan Zhu;Gang Chen;Xiaofei Wu;Wenqing Liu
我们通过将还原氧化石墨烯（RGO）分散到乳液型施胶剂中，成功制备了具有良好分散性和稳定性的石墨烯改性碳纤维（CF）施胶剂。利用没食子酸还原氧化石墨烯（GO）得到RGO。采用微粘结测试和三点弯曲法研究了石墨烯改性施胶剂对CF-环氧树脂复合材料界面性能的影响。结果表明，当改性石墨烯的粒径小于1 μm，RGO的含量为20 ppm，施胶剂的pH值为10.5时，可获得最佳的界面性能。复合材料的界面剪切强度达到92.3MPa，比未改性碳纤维的复合材料提高了29.6%。与商用CF织物增强复合材料相比，用RGO改性施胶剂处理的复合材料的层间剪切强度提高了21.5%。用扫描电子显微镜（SEM）观察了复合材料的界面和层间破坏形态。结果表明，经RGO改性施胶剂处理后的碳纤维表面附着了大量的残余树脂，表明碳纤维与树脂基体之间具有良好的界面性能。© 2018 Wiley Periodicals，Inc. J.应用聚合物Sci.2019，136，47122.
We successfully prepared a graphene‐modified carbon fiber (CF) sizing agent with good dispersity and stability by dispersing reduced graphene oxide (RGO) into an emulsion‐type sizing agent. RGO was obtained by the reduction of graphene oxide (GO) with the help of gallic acid. The influence of the graphene‐modified sizing agent on the interfacial properties of the CF–epoxy resin composites was investigated with microbond testing and the three‐point bending method. The results show that optimized interfacial properties were achieved when the size of the modified graphene was less than 1 μm, the content of RGO was 20 ppm, and the pH value of the sizing agent was 10.5. The interfacial shear strength of the composites reached 92.3 MPa, which was 29.6% higher than that of the composites with unmodified CFs. Compared with commercial‐CF‐fabric‐reinforced composites, the interlaminar shear strength of the composites treated with the RGO‐modified sizing agent increased by 21.5%. Both the interfacial and interlaminar failure morphologies of the composites were examined with scanning electron microscopy (SEM). The results show that a large amount of residual resin adhered to the surfaces of the CFs treated with the RGO‐modified sizing agent; this indicated good interfacial properties between the CFs and the resin matrix. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2019,136, 47122.