以聚醚酰亚胺(PEI)为修饰剂，对氧化后的碳纤维(CF)进行表面修饰，并通过红外光谱、X射线光电子能谱和扫描电镜(SEM)表征了表面修饰效果。结果表明，氧化处理使CF表面PEI 修饰层更加均匀。考察了PEI 和CF含量对CF增强聚碳酸酯(PC/CF)复合材料力学性能、导热性能及耐热性能的影响，发现PEI 修饰层使PC/CF复合材料的拉伸强度比未经修饰的PC/CF 提高了35.2%，维卡软化温度(VST)进一步上升了约2 ℃，热导率最大提高了13.1%。拉伸样条断面的SEM图确认了PEI 修饰层改善了复合材料的界面附着效果。结合复合材料中CF 的长度分布统计及样品断面的SEM图对PC/CF复合材料的性能表现进行了分析。
The surface modification of carbon fiber (CF) treated by oxidation was carried out usingpolyetherimide (PEI) as modifier. The effects of surface treatment were characterized by infrared spectroscopy (IR),X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The results show that the oxidized CF can obtain a more uniform and complete PEI modified layer. The effects of PEI and CF content on the mechanical properties, thermal conductivity and heat resistance of the CF reinforced polycarbonate (PC/CF) composites were investigated. It is found that the tensile strength of PC/CF composites is increased by 35.2%, the Vicat softening temperature (VST) is increased by about 2 ℃, and the thermal conductivity is increased by 13.1% after modified by PEI. The SEM images of tensile splinesection confirm that the PEI modified layer improves the interfacial adhesion of composites. The performance of PC/CF composites was analyzed based on the statistics of the length distribution of CF and the SEM images of the sample sections.