四嗪改性碳纳米管环氧摩擦材料的研究

Research on Tetrazine Modified Carbon Nanotube Epoxy Friction Materials

利用Diles-Alder反应,采用3,6-二氨基-1,2,4,5-四嗪对碳纳米管(CNTs)改性处理,考察了改性处理对碳纳米管表面结构、分散程度以及对环氧复合材料性能的影响,通过扫描电镜(SEM)、红外光谱(FTIR)Raman)分析了材料表面磨损形貌、多壁碳纳米管(MWNTs)分散程度以及碳纳米管结构变化,并探讨复合材料摩擦磨损机理、四嗪与碳纳米管反应机理。结果表明,通过四嗪化合物处理碳纳米管后,碳管表面连接活性基团氨基,结构形态发生改变,提高碳纳米管在基体中分散性和复合材料摩擦性能,8h处理MWNTs/EP比未处理MWNTs/EP复合材料摩擦系数降低6.5%,磨耗率降低71.4%。

Multi-walled carbon nanotubes react with 3,6-diaminotetrazine under heating, and MWNTs/EP composites are prepared by casting molding. The wear tests of epoxy conmposite specimens under air-lubricated condition are carried out on a ring-block wear tester typed M-200. After the wear tests, the worn surface of the composites are examined by a scanning electron microscope（SEM）. To characterize the dispersion of the CNTs, transmission electron microscopy（TEM） is used, and Raman spectroscopy is used for the characterization of the MWNTs. The results show that the morphology and structure of the nanotube treated by tetrazine show major changes, which can undergo a [4＋ 2]cycloadditon resulting in the formation of an Y-junction. And MWNTs disperse well in matrix. With treated MWNTs, the MWNTs/EP composite exhibits lower friction coefficient and wear rate than those of untreated MWNTs.