超支化聚酰胺修饰碳纳米管/环氧树脂复合材料的制备及性能
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1.重庆工商大学 废油资源化技术与装备教育部工程研究中心,重庆 400060;2.重庆市智翔铺道技术工程有限公司,重庆 401336;3.招商局重庆交通科研设计院有限公司,重庆 400067

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国家自然科学基金资助项目(52178440)


Preparation and Properties of Hyperbranched Polyamide Modified Carbon Nanotubes/Epoxy Resin Composites
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    摘要:

    本文尝试制备了不同支化度的超支化聚酰胺接枝修饰碳纳米管,并对碳纳米管接枝前后的微观结构进行了表征,FTIR及TGA的分析结果表明,超支化聚酰胺成功接枝到碳纳米管表面;透射电子显微镜TEM分析结果表明,三种支化度的超支化聚酰胺均在碳纳米管表面形成了聚合物包裹层,管径明显增加,且支化度越高,管径增加越多。进一步地,将上述所制备的超支化聚酰胺修饰碳纳米管加入环氧树脂体系,制备了不同改性环氧树脂复合材料,DMA和力学性能分析结果表明,超支化聚酰胺修饰碳纳米管/环氧树脂复合材料的储能模量、玻璃化转变温度Tg、力学损耗峰高度均比未经修饰的碳纳米管/环氧树脂复合材料有所降低,冲击韧性明显提高,证明了超支化聚酰胺大量的分子支链对环氧树脂的增韧贡献,且支化度越高,增韧效果越明显;光学显微镜及扫描电子显微镜SEM分析结果显示,超支化聚酰胺加入明显改善了碳纳米管在环氧树脂中的分散性;从增韧机制来看,该体系的增韧机理属于碳纳米管拔出机制,碳纳米管的拔出物基本都是短凸棱拔出,碳纳米管大多被拉断,表明超支化聚酰胺修饰碳纳米管与环氧树脂形成了非常牢固的连接,对环氧树脂具有优异的增韧效果。

    Abstract:

    In this paper, hyperbranched polyamide grafted modified carbon nanotubes with different branching degrees were prepared, and the microstructure of carbon nanotubes before and after grafting was characterized. The results of FTIR and TGA showed that hyperbranched polyamide was successfully grafted onto the surface of carbon nanotubes; TEM analysis showed that the hyperbranched polyamides with three degrees of branching formed a polymer coating on the surface of carbon nanotubes, and the pipe diameter increased significantly, and the higher the degree of branching, the more the pipe diameter increased. Furthermore, the hyperbranched polyamide modified carbon nanotubes prepared above were added to the epoxy resin system to prepare different modified epoxy resin composites. The results of DMA and mechanical properties analysis showed that the storage modulus, glass transition temperature Tg, and the height of mechanical loss peak is lower than that of unmodified carbon nanotube / epoxy resin composite, and the impact toughness is significantly improved. It is proved that a large number of molecular branches of hyperbranched polyamide contribute to the toughening of epoxy resin, and the higher the degree of branching, the more obvious the toughening effect is; SEM analysis showed that the addition of hyperbranched polyamide significantly improved the dispersion of carbon nanotubes in epoxy resin; The toughening mechanism of the system belongs to the carbon nanotube pull-out mechanism. The pull-out objects of carbon nanotubes are basically pulled out by short convex edges, and most carbon nanotubes are pulled off, indicating that hyperbranched polyamide modified carbon nanotubes form a very firm connection with epoxy resin, which has excellent toughening effect on epoxy resin.

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  • 收稿日期:2022-02-21
  • 最后修改日期:2022-07-06
  • 录用日期:2022-07-18
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