羟基化多壁碳纳米管对氰酸酯树脂的复合改性研究

Study on the modification of cyanate ester resin used hydroxylated multi-walled carbon nanotubes

采用经表面修饰产生羟基碳纳米管(CNT-OH)与氰酸酯树脂(CE)发生化学键合作用,又经超声处理,克服纳米粒子"自聚"弊端,增强其与树脂相容性,制得CE树脂体系和CE/碳纤维增强复合材料(CFRP)(CE/CFRP),使CE树脂体系和CE/CFRP宏观性能大为强化增益。测定了不同CNT-OH用量对CE树脂体系导热性能和冲击韧性的影响,采用扫描电子显微镜对冲击断面进行观察。结果表明:当CNT-OH用量小于5.0%(wt,质量分数)时,CE树脂体系的导热系数随CNT-OH用量的增加而增高,当用量大于5.0%(wt,质量分数),导热系数增加趋势变缓。CNT-OH对CE树脂体系有一定的增韧作用,当用量为3.0%(wt,质量分数)时,CE的冲击韧性最高达到4.88J/m2,冲击断面呈韧性断裂。同时测定了CNT-OH用量为0%和3.0%的CE/CFRP层间剪切强度和压缩强度,结果表明添加3.0%CNT-OH的CE/CFRP层间剪切强度达到84.9MPa,压缩强度达到1041.0MPa,比未改性CE/CFRP分别提高了19.2%和15.7%。

Cyanate ester（CE）and CE/carbon fiber composites（CE/CFRP）were made.Macro-scale performance of CE and CE/CFRP were both improved significantly,due to the improved compatibility between hydroxylated multiwalled carbon nanotube（CNT-OH）and CE.This was achieved by avoiding the self-agglomeration via the chemical bonding between hydroxyl group on the CNT and CE,followed by ultrasonic treatment of the resin mixture.Thermal conductivity and impact toughness were determined for CE neat resin plaques with various loading levels of CNT-OH.The cross section of impact specimen was inspected by scanning electron microscope.The results showed that coefficient of the thermal conductivity of CE was increased as the CNT-OH loading level increased,but the increasing tendency slowed when the loading level was more than 5.0 wt%.Impact toughness was also improved as CNT-OH loading level increased.The best impact toughness of 4.88 J/m2 was achieved at 3.0 wt% CNT-OH loading level.Fracture surface of the impact specimens showed typical ductile fracture.The mechanical properties,including interlaminar shear strength（ILSS）and compressive strength,were also evaluated on CE/CFRP with 0 wt% and3.0 wt% CNT-OH loading level.The results showed that ILSS reached 84.9 MPa and the compressive strength 1041.4 MPa with 3.0 wt% CNT-OH loading level,which were increased 19.2% and 15.7% respectively,compared to unmodified CE/CFRP.