采用溶液技术制备出膨胀石墨增强环氧树脂复合材料. 对石墨进行化学改性以提高与环氧树脂的相容性. 采用XRD﹑FE-SEM和HR-TEM对环氧树脂/膨胀石墨复合材料进行表征. 与环氧树脂相比,添加质量分数9%膨胀石墨后,该复合材料的热分解温度从340 ℃升高至480 ℃,抗张应力提高30%,导电率由10-15增加至10-5数量级. 热学﹑力学和电学性能的显著提高,主要归因于膨胀石墨纳米片在环氧树脂基体中的良好分散性,从而可用于广泛的应用领域.
Expanded graphite ( EG)-reinforced epoxy composites were prepared by a solution mixing method. The structure and morphology of the EG/epoxy composites were investigated by XRD, FE-SEM and HR-TEM. The EG prepared by acid oxidation and thermal expansion shows good compatibility with the epoxy resin that enters the EG layers to decrease their thickness to 60-70 nm, owing to its abundant oxygen-containing functional groups. With the addition of 9 wt% EG, the thermal decomposition temperature of the composite increases from 340 to 480℃, the electrical conductivity from 10-15 to 10-5 S/cm and the tensile stress is increased by more than 30%. These improvements are attributed to the good dispersion of EG sheets in the epoxy matrix.
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