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采用H_2O_2和浓HNO_3对碳纤维(CF)表面分别进行氧化处理,得到氧化碳纤维(OCF1和OCF2),采用硅烷偶联剂γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)对OCF1进行接枝处理,得到接枝改性碳纤维(KCF),将改性前后CF应用于不饱和聚酯(UP)自修复复合材料中,分析比较了不同改性剂及改性方法对碳纤维/不饱和聚酯(CF/UP)自修复复合材料性能的影响。利用FTIR、XPS、SEM表征CF与CF/UP自修复复合材料的化学结构与形貌,通过TGA、万能拉力试验机、悬臂梁冲击仪、邵氏硬度计等对复合材料的热稳定性、力学性能及自修复效率进行测试。结果表明:氧化、接枝反应均可增加CF表面的粗糙度和活性官能团含量,从而改善CF与UP基体的界面相容性。其中OCF1/UP自修复复合材料的综合力学性能比OCF2/UP自修复复合材料好,KCF/UP自修复复合材料的力学性能在三者之中最佳,其自修复效率最高,可达67.03%。
Carbon fibers (OCF1 and OCF2) were oxidized by using H_2O_2 and HNO_3 respectively, and the surface of carbon fiber (CF) was oxidized with silane coupling agent γ-methacryloxypropyltrimethoxysilane (KH-570) OCF1 was grafted to obtain the modified carbon fiber (KCF). The modified CF was applied to the self-healing unsaturated polyester (UP) composites. The effects of different modifiers and modification methods on the carbon fiber / Effect of Unsaturated Polyester (CF / UP) Self-healing Composite Performance. The chemical structure and morphology of CF and CF / UP self-healing composites were characterized by FTIR, XPS and SEM. The thermal stability and mechanical properties of composites were tested by TGA, universal tensile testing machine, Izod impact tester and Shore hardness tester. Performance and self-healing efficiency of the test. The results show that both the oxidation and grafting reaction can increase the roughness of the CF surface and the content of active functional groups, so as to improve the interfacial compatibility between CF and UP matrix. Among them, the mechanical properties of OCF1 / UP self-healing composites are better than that of OCF2 / UP self-healing composites. The mechanical properties of KCF / UP self-healing composites are the best among the three, and the self-healing efficiency is the highest, up to 67.03% .