KH550修饰碳纳米管增韧环氧树脂的研究

Study on Multi-Walled Carbon Nanotubes Modified with KH550 on Toughening Epoxy Resin

利用偶联剂KH550对多壁碳纳米管(MWCNTs)进行化学修饰,并制备了MWCNTs/环氧树脂纳米复合材料。研究了不同含量的MWCNTs对纳米复合材料力学性能的影响。研究结果表明,MWCNTs表面成功接枝上了一定量的KH550,将其加入环氧树脂基体可大幅提高复合材料的力学性能。当添加量达到0.5%时,复合材料的力学性能最好,冲击韧度和弯曲强度较纯环氧树脂分别提高了85.3%和21.6%。扫描电镜结果显示,复合材料由脆性断裂转变为韧性断裂。

The multi-walled carbon nanotubes were modified with coupling agent KH550 and carbon nanotubes/epoxy resin nanoeom-posites were prepared. The effects of different MWCNTs contents on the mechanical properties of nanocomposites were studied. The resuits show that a certain amount of KH550 are introduced onto the surface of MWCNTs. The mechanical properties of nanocomposites are greatly enhanced by filling the proper amount of MWCNTs. When MWCNTs content is 0.5% , the mechanical properties are the best. Compared with the pure epoxy resin, the impact strength and flexural strength are increased by 85.3% and 21.6% respectively. SEM show that the fracture pattern of composites are changed from brittle fracture to ductile fracture.