棒状纳米铁氧化物增强碳纤维/环氧树脂复合材料的层间性能

摘要

In order to solve the problem of interlayer failure of carbon fiber (CF)reinforced epoxy resin (EP)composites,the methacryloxypropyl trimethoxysilane (KH-570)modified iron oxide nanorods FeOOH and Fe2 O 3 were used to enhance the interlaminar fracture toughness of composites for first time.The double cantilever beam and end notched flexural tests were carried out to indicate the effect of the iron oxide nanorods on CF/EP composites model Ⅰ G ⅠC and model Ⅱ interlaminar fracture toughness G ⅡC .The interlaminar shear strength of the composites was tested by short beam shear (SBS)test.The results show that when the content of nanoparticles is 1% mass fraction of EP,the addition of iron oxide nanorods can sig-nificantly improve the interlaminar shear strength and fracture toughness of CF/EP composites.And the toughening effect of FeOOH is better than that of Fe2 O 3 .Among them,the interlaminar shear strength of FeOOH/CF/EP composites is 58.85 MPa,which is 41% higher than that of CF/EP composites.G ⅠC and G ⅡC of FeOOH/CF/EP composites are 0.685 kJ/m2 and 2.28 kJ/m2 ,which improves respectively 99% and 29% higher than that of CF/EP composites.%为解决连续碳纤维(CF)增强环氧树脂(EP)复合材料的层间失效问题,采用 γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)改性的2种棒状纳米铁氧化物(FeOOH、Fe2 O 3)对复合材料进行增韧改性.采用双悬臂梁和端部缺口弯曲实验测试复合材料的Ⅰ型层间断裂韧性GⅠC及Ⅱ型层间断裂韧性GⅡC,采用短梁剪切实验(SBS)测试复合材料的层间剪切强度.实验结果表明,纳米粒子添加量为EP基体的1%质量分数,2种棒状纳米铁氧化物的加入均能显著改善复合材料的层间剪切强度和层间断裂韧性,且FeOOH的改善作用明显优于Fe2 O3.其中,FeOOH/CF/EP复合材料的SBS剪切强度为58.85 MPa,较CF/EP复合材料提高了41%,GⅠC、GⅡC分别为0.685、2.28 kJ/m2,较CF/EP复合材料分别提高了99%和29%.