碳纳米管基体改性碳纤维增强环氧树脂基复合材料的性能研究

Study on properties of carbon nanotube matrix modified carbon fiber reinforced epoxy resin matrix composites

为研究碳纳米管(CNTs)对碳纤维增强环氧树脂基复合材料(CF/EP复合材料)性能的影响,采用超声共混的方式将CNTs引入到CF/EP复合材料基体体系中,制备CNTs基体改性碳纤维增强环氧树脂基复合材料(CF/EP-CNTs复合材料)。对两种复合材料的黏弹性能、热稳定性能、弯曲性能和耐疲劳性能进行测试。结果表明40.0℃时CF/EP-CNTs复合材料的储能模量E′值较CF/EP复合材料提高了16.1 GPa,Tg值略有降低;CF/EP-CNTs复合材料开始热降解的温度较CF/EP复合材料低,热稳定性略有下降;CF/EP-CNTs复合材料的弯曲强度和弯曲模量比CF/EP复合材料分别提高了6.3%和15.9%;经40000次弯曲疲劳后,CF/EP-CNTs复合材料的弯曲强度保持率和弯曲模量保持率高达90.7%和93.8%。

In order to study the effects of carbon nanotubes(CNTs)on the properties of carbon fiber reinforced epoxy resin matrix composites(CF/EP composites),the CNTs were introduced into the CF/EP composite matrix system by ultrasonic blending to prepare carbon fiber reinforced epoxy resin matrix composites whose matrix was modified with CNTs(CF/EP-CNTs composites).The viscoelasticity,thermal stability,bending performance and fatigue resistance of two kinds of composites were tested.The results showed that,the storage modulus E′value of CF/EP-CNTs composites at 40.0℃increased by 16.1 GPa compared with that of CF/EP composites,while the Tg value reduced slightly.The thermal degradation temperature of CF/EP-CNTs composites was lower than that of CF/EP composites,and the thermal stability decreased slightly.The bending strength and bending modulus of CF/EP-CNTs composites increased by 6.3%and 15.9%respectively compared with CF/EP composites.The bending strength retention rate and bending modulus retention rate of CF/EP-CNTs composites reached 90.7%and 93.8%after 40000 times bending fatigue.