氧化石墨烯的功能化制备及其极低添加量下对环氧树脂复合体系增强和增韧的研究

Functionalization of Graphene Oxide and the Enhancement and Toughening of Epoxy Resin Composite System under Very Low Dosage of Graphene Oxide

通过氧化石墨烯(GO)和聚醚胺的酰胺化反应制备了具有富胺表面和长链分子的功能化氧化石墨烯(DGO),并制备了DGO/环氧树脂复合材料。研究了聚醚胺修饰氧化石墨烯对环氧树脂复合材料力学性能的影响。通过X射线衍射、傅里叶转换红外光谱、热失重分析和拉曼光谱等测试对DGO进行了分析。结果表明,DGO相对于GO层间距增大;在2 965、2 922、和2 866 cm-1处出现DGO的特征峰;D带和G带峰强比值增大;热残重降低证实聚醚胺在GO上成功接枝。力学性能测试结果表明,氧化石墨烯的加入提高了复合材料的力学性能,0.3%DGO的加入,使环氧树脂的拉伸强度、断裂伸长率、弯曲强度和弯曲模量分别提高了19.1%、74.4%、38.6%和16.8%,实现了极低添加量下同时增加环氧树脂强度和韧性。

The functionally oxidized graphene（ DGO） with rich amine surface and long-chain molecules was prepared by the amide reaction of graphene oxide（ GO） and polyether amine,then the epoxy（ EP）composites with GO or DGO were prepared. And the effects of polyether amine modified graphite on the mechanical properties of epoxy resin composites were studied. The DGO was analyzed by X-ray diffraction,Fourier transform infrared spectroscopy,thermal weightlessness analysis and Raman spectroscopy. The results show that： DGO spacing is larger than GO spacing; the characteristic peaks of DGO appears at 2 965,2 922,and 2 866 cm^（-1）; the intensity ratio of D peak with G peak for DGO is increased; the reduction of the solid residue of DGO confirms that polyether amine successfully grafted on GO. The results of mechanical properties test show that the addition of graphene improves the mechanical properties of the composites. The addition of 0. 3 wt% DGO could increase the tensile strength, elongation at break, flexural strength and flexural modulus of EP by 19. 1%,74. 4%,38. 6% and 16. 8%,respectively. Therefore,both the strength and toughness of epoxy resin are increased under very low DGO dosage.