摘要
以聚酰亚胺(PI)为基体、碳纤维(CF)和碳纳米管(CNTs)为复合增强体,采用热模压工艺制备了不同CNTs含量的PI/CF/CNTs复合材料。采用电子拉力机、动态热机械分析仪和热重分析仪研究了PI/CF/CNTs复合材料的力学性能、动态力学性能和热稳定性。结果表明,与未加CNTs的PI/CF复合材料相比,CNTs含量为PI质量的0.2%时,PI/CF/CNTs复合材料具有最佳的常温力学性能,其中常温拉伸强度提高19.5%,常温弯曲强度提高20.6%,常温层间剪切强度提高14.7%,玻璃化转变温度则由357℃提高到451℃;CNTs含量为PI质量的0.05%时,PI/CF/CNTs复合材料具有最佳的高温力学性能,其中400℃拉伸强度提高15.8%,400℃弯曲强度提高9.6%,400℃层间剪切强度提高12.8%。CNTs的添加对PI/CF/CNTs复合材料的热稳定性几乎没有影响。
Taking polyimide(PI)as matrix,carbon fiber(CF)and carbon nanotubes(CNTs)as composite reinforcement,PI/CF/CNTs composites with different CNTs contents were prepared by hot-molding process.The mechanical properties,dynamic thermomechanical properties and thermal stability of PI/CF/CNTs composites were studied by using electronic tensile machine,dynamic thermomechanical analyzer and thermogravimetric analyzer.The results show that compared with PI/CF composites without CNTs,when the CNTs content is 0.2%of PI mass,the PI/CF/CNTs composite has the best mechanical properties at room temperature,the tensile strength and flexural strength at room temperature are increased by 19.5%and 20.6%respectively,the interlaminar shear strength at room temperature is increased by 14.7%,the glass transition temperature is increased from 357℃to 451℃.When the CNTs content is 0.05%of PI mass,the PI/CF/CNTs composite has the best high-temperature mechanical properties,the tensile strength and flexural strength at 400℃are increased by 15.8%and 9.6%respectively,and the interlaminar shear strength at 400℃is increased by 12.8%.The addition of CNTs has almost no effect on the thermal stability of PI/CF/CNTs composites.
作者
于广
魏化震
李大勇
高守臻
罗长宏
马开宝
王晓立
宋爱琪
成毕勤
Yu Guang;Wei Huazhen;Li Dayong;Gao Shouzhen;Luo Changhong;Ma Kaibao;Wang Xiaoli;Song Aiqi;Cheng Biqin(Shandong Institute of Non-metallic Materials,Jinan 250031,China;Shandong Zhengyuan Geophysical Information Technology Co.Ltd.,Jinan 250101,China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2020年第5期143-148,共6页
Engineering Plastics Application
关键词
碳纳米管
聚酰亚胺
碳纤维
复合材料
耐高温性能
carbon nanotubes
polyimide
carbon fiber
composite
high temperature resistance
