碳纳米管及炭纤维协同强韧双马来酰亚胺树脂复合材料

Preparation and mechanical properties of MWCNT and carbon fiber reinforced bismaleimide resin composite

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43.85GPa、1160.62MPa和28.50kJ/m²，与CF/BMI复合材料相比，分别提高了49.56%、17.41%和19.65%。

Abstract: 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 ethylene 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.