硅烷修饰的氧化石墨烯对碳纤维/BMI复合材料的界面改性研究

Interfacial Modification of Carbon Fiber/BMI Composites with Silane Modified Graphene Oxide

利用改进的Hummers法制备氧化石墨烯,选用硅烷偶联剂γ-氨丙基三乙氧基硅烷对氧化石墨烯进行功能化修饰,在其表面接枝上和BMI树脂反应的胺基,进而考察硅烷修饰的氧化石墨烯对碳纤维/BMI复合材料界面黏结性能的影响。采用红外光谱、拉曼光谱、X射线衍射分析、X射线光电子能谱等对硅烷修饰的氧化石墨烯进行表征,对碳纤维复合材料进行层间剪切强度测试并利用扫描电子显微镜观察材料断口形貌。结果表明,硅烷分子成功地接枝到氧化石墨烯表面,复合材料的界面黏结性能得到明显改善。

Graphene oxide was prepared by improved Hummers method, which was functionalized with a silane coupling agent 3-aminopropyltriethoxysilane. Amino groups were grafted on the graphene oxide surface and react with BMI resin. Effects of silane functionalized graphene oxide on the interfacial properties of carbon fiber/BMI composites were studied. Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray diffraction analysis and X-ray photoelectron spectroscopy were used to characterize the silane functionalized graphene oxide. The interfacial shear strength of the carbon fiber/BMI composites was tested and their fracture morphology was observed with scanning electron microscope. The results indicate that silane molecules are successfully grafted onto the graphene oxide surface and the interfacial adhesion of the carbon fiber/BMI composites are greatly improved.