本文制备了二氧化硅包覆的碳纳米管,并在其表面引入氨基,从而获得在环氧树脂基体中分散性良好的化学修饰的碳纳米管.首先通过强碱醇溶液处理碳纳米管,制备羟基化碳纳米管(MWNTs-OH),然后将MWNTs-OH分散于乙醇溶液中,加入正硅酸乙酯(TEOS),通过St(o)ber法制备了表面包覆二氧化硅的碳纳米管(MWNTs-SiO2);将MWNTs-SiO2进一步与氨丙基三乙氧基硅烷反应,得到氨基化二氧化硅包覆碳纳米管(MWNTs-SiO2-NH2).将所制备的MWNTs-SiO2-NH2与缩水甘油醚型环氧树脂E-44复合,并以三乙醇胺为固化剂,得到氨基化碳纳米管/环氧树脂复合材料.实验结果表明,碳纳米管表面成功地引入了氨基基团;表面氨基化碳纳米管在环氧树脂基体中的分散性得到了显著的提高,同时氨基化碳纳米管能够显著地提高复合材料的冲击强度和拉伸强度.
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