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采用机械搅拌和离心分散的方法制备了多壁碳纳米管-有机蒙脱土/环氧树脂复合材料。X射线衍射分析表明,当有机蒙脱土含量为2 wt%时,蒙脱土在树脂体系中能够形成离散性结构。断裂韧性测试结果表明,多壁碳纳米管和有机蒙脱土的混杂对环氧树脂具有协同增韧的作用。当有机蒙脱土含量为2 wt%,多壁碳纳米管含量为0.1 wt%时,所得复合材料的断裂韧性是纯环氧树脂的1.77倍,是2 wt%有机蒙脱土/环氧树脂复合材料的1.45倍,是0.1 wt%多壁碳纳米管/环氧树脂复合材料的1.39倍。扫描电镜分析表明,多壁碳纳米管在环氧树脂体系中分散均匀,并与有机蒙脱土片层形成了一定程度的相互穿插和咬合,多壁碳纳米管与有机蒙脱土协同增韧的主要原因是微裂纹增韧、剪切屈服与纤维拔出。
Multi-walled carbon nanotubes-montmorillonite / epoxy composites were prepared by mechanical stirring and centrifugal dispersion. X-ray diffraction analysis showed that when the content of organic montmorillonite is 2 wt%, montmorillonite can form discrete structure in the resin system. The results of fracture toughness test show that the hybrid of multi-walled carbon nanotubes and organic montmorillonite has the synergistic toughening effect on epoxy resin. When the content of organic montmorillonite is 2 wt% and the content of multiwalled carbon nanotubes is 0.1 wt%, the fracture toughness of the obtained composite is 1.77 times that of the pure epoxy resin, which is 2 wt% of the organic montmorillonite / epoxy resin 1.45 times that of composite, 1.39 times that of 0.1 wt% MWCNT / epoxy composites. Scanning electron microscopy analysis showed that the multi-walled carbon nanotubes dispersed uniformly in the epoxy resin system, and formed a certain degree of interpenetration and occlusion with the organic montmorillonite. The multi-walled carbon nanotubes were synergistically toughened with the organic montmorillonite The main reason is the micro-crack toughening, shear yielding and fiber pull-out.