以膨胀石墨(100 mesh)为原料,采用改进的水热法,经超声剥离制备了氧化石墨烯(GO).通过X射线衍射、原子力显微镜及傅里叶变换红外光谱对GO结构进行表征,进而采用两相萃取法将制得的GO萃取到环氧树脂(EP)基体中.利用X射线衍射、扫描电镜等对GO/EP复合材料的断面形貌及GO在树脂中的分散状况进行表征,并进行了力学性能测试及动态力学分析.结果表明,GO厚度约为1.4 nm,复合材料的力学性能较纯环氧明显提高,GO的加入使环氧树脂冲击断面转变为塑性断裂.当GO加入量为0.25％(质量分数)时,材料的冲击强度最高,强度值为55.17kJ/m2,提高了115％;拉伸强度提高了18％;断裂伸长率增加了78％.经动态力学分析可推断,GO的加入增强了其与环氧树脂间的界面粘接性,同时影响到环氧树脂聚合网络的形成.改性后的环氧树脂韧性大幅度增加.
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