碳纳米管及炭纤维协同强韧双马来酰亚胺树脂复合材料

摘要

采用氨基化碳纳米管(CNTs)强韧双马来酰亚胺树脂(BMI)基体树脂,制备碳纳米管/炭纤维(CNT/CF)协同增强BMI的三相复合材料.结果表明,乙二胺以共价键的形式接枝到了MWCNTs表面,MWCNTs-NH2表面的N元素质量分数达3.53％；质量分数为0.5％ MWCNTs-NH2的三相复合材料的弯曲模量、弯曲强度及冲击强度分别为43.85 GPa、1 160.62 MPa和28.50 kJ/m2,与CF/BMI复合材料相比,分别提高了49.56％、17.41％和19.65％.%Bismaleimide reinforced with both MWCNTs and carbon fibers was prepared by mold-pressing carbon fiber paper stacks impregnated with a bismaleimide acetone solution containing MWCNTs grafted with ethyl-ene diamine. The MWCNTs were oxidized by concentrated HNO3 to form carboxyl groups before grafting. Results show that the flexural modulus, flexural strength and impact strength of composite with a 0. 5 mass% of MWCNTs is 43. 85 GPa, 1 160. 62 MPa and 28. 50 kJ/m2, which represent increases of 49. 56% , 17.41% and 19.65% respectively compared with the carbon fiber/BMI composite.