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采用二乙烯三胺(DETA)对碳纳米管(MWNTs)进行改性,并用X射线衍射(XRD)和傅里叶变换红外光谱(FTIR)对其进行表征。发现DETA被有效地包覆在MWNTs表面。并将改性前后的MWNTs与环氧树脂进行复合,采用浇铸成型法制备了MWNTs/环氧树脂纳米复合材料,测试其力学性能,并采用透射电镜(TEM)研究其分散性,扫描电镜(SEM)对其断口进行了分析研究。结果表明,少量的改性MWNTs可以使复合材料的力学性能提高,具有明显的增韧作用。当MWNTs的含量为0.6%时,纳米复合材料的冲击强度与纯环氧体系相比,提高幅度达400%以上,弯曲强度和弯曲模量的提高幅度均达到了100%以上。
Carbon nanotubes (MWNTs) were modified by diethylenetriamine (DETA) and characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). DETA was found to be effectively coated on the surface of MWNTs. The MWNTs and epoxy resin before and after modification were composited. The MWNTs / epoxy nanocomposites were prepared by casting method. The mechanical properties of MWNTs / epoxy composites were tested. The dispersibility was observed by transmission electron microscopy (TEM) The fracture was analyzed. The results show that a small amount of modified MWNTs can improve the mechanical properties of the composites with obvious toughening effect. When the content of MWNTs is 0.6%, the impact strength of nanocomposites increases by more than 400% compared with the pure epoxy system, and the improvement of flexural strength and flexural modulus are both above 100%.