摘要
利用模压法制备了碳纤维增强聚酰亚胺(PI/CF)复合材料,然后分别在300,350,400,450℃下对PI/CF复合材料进行1 h热处理。采用电子拉力机、光学显微镜、动态热机械分析仪和热重分析仪研究了PI/CF复合材料的力学性能、断面形貌、动态热机械性能和热稳定性能。结果表明,相比于未经热处理的PI/CF复合材料,热处理后复合材料的常温拉伸性能略有降低,常温弯曲性能略有提高,常温层间剪切强度可提高9.2%;400℃拉伸强度可提高21.1%,400℃拉伸弹性模量可提高9.4%,400℃弯曲强度可提高21.8%,400℃弯曲弹性模量可提高12.2%,400℃层间剪切强度可提高24.9%;玻璃化转变温度由354℃提高到440℃;起始热分解温度由550.4℃提高到573.9℃。
The polyimide/carbon fiber(PI/CF)composite was prepared by the compression molding method,and then PI/CF composite was heat-treated at 300℃,350℃,400℃,and 450℃for 1 h.The mechanical properties,cross-sectional morphology,dynamic thermomechanical properties and thermal stability of PI/CF composites were studied using an electronic tensile machine,optical microscope,dynamic thermomechanical analyzer and thermogravimetric analyzer.The results show that compared with unheated carbon fiber/polyimide composites,the tensile properties at room temperature of the composites after heat treatment are slightly reduced,the bending properties at room temperature are slightly improved,and the interlaminar shear strength at room temperature can be increased by 9.2%.The tensile strength at 400℃can be increased by 21.1%,the tensile modulus at 400℃can be increased by 9.4%,the bending strength at 400℃can be increased by 21.8%,the bending modulus at 400℃can be increased by 12.2%,and the interlaminar shear strength at 400℃can be increased by 24.9%.Glass transition temperature increased from 354℃to 440℃.Initial thermal decomposition temperature can be increased from 550.4℃to 573.9℃.
作者
于广
魏化震
李大勇
高守臻
罗长宏
马开宝
王晓立
Yu Guang;Wei Huazhen;Li Dayong;Gao Shouzhen;Luo Changhong;Ma Kaibao;Wang Xiaoli(Shandong Institute of Non-metallic Materials,Jinan 250031,China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2020年第6期62-67,共6页
Engineering Plastics Application
关键词
碳纤维
聚酰亚胺
复合材料
热处理温度
耐高温性能
carbon fiber
polyimide
composites
heat treatment temperature
high temperature resistance
