为提高碳纳米材料在极性/非极性溶液和聚合物基体中的分散性和相容性，以乙酸乙烯酯为单体，采用自由基聚合的方法，对碳纳米管和石墨烯两种碳材料进行包覆改性。采用红外光谱、热重分析、扫描电子显微镜和拉曼光谱表征了包覆碳材料的效果。经红外光谱表征，包覆后的碳纳米材料出现了乙酸乙烯酯的特征吸收峰，热重曲线中170~240 ℃出现明显的失重，从拉曼光谱中可以看出，改性后的碳纳米管和石墨烯的I _D/I _G分别从1.730和1.040降低至1.090和0.985，表明石墨化程度增加，说明了乙酸乙烯酯改性碳纳米材料成功。通过紫外光谱测试表征了包覆后碳材料的分散性和稳定性，发现包覆后的碳纳米材料具有优异的分散性和稳定性。因此，原位聚合得到的聚乙酸乙烯酯成功包覆到了碳材料表面，包覆过程没有对碳纳米材料本身结构规整性造成破坏，保证了碳纳米材料原有的性能不受影响。当乙酸乙烯酯与碳材料的质量比为1∶1和2∶1时，聚乙酸乙烯酯包覆碳纳米材料的效果较好，且改性后的碳纳米材料具有优异的分散性和稳定性。

In order to enhance dispersity and compatibility of the carbon nanomaterials in polar/non polar solutions and polymers, carbon nanotube and graphene were modified using ethyl acetate as a monomer by free radical polymerization. The effects of coatings on carbon nanomaterials were characterized by infrared spectra, thermogravimetric analysis, scanning electron microscope, and Raman spectrum. Through infrared spectra, the coated carbon nanomaterial exhibited a characteristic absorption peak of vinyl acetate, and a significant weight loss occurred at 170~240 ℃ in the thermogravimetric curves. From Raman spectrum, the I _D/I _G of the modified carbon nanotubes and graphene decreased from 1.730 and 1.040 to 1.090 and 0.985, respectively, indicating an increase in the degree of graphitization. The results indicate the success of vinyl acetate modified carbon nanomaterials. Dispersity and compatibility of modified carbon nanomaterials were assayed by ultraviolet spectra, discovering that the coated carbon nanomaterials exhibit excellent dispersibility and stability. The results indicated that the surfaces of carbon nanomaterials were coated by polyvinyl acetate via in-situ polymerization. The structures of carbon materials were not destroyed by coating process and their properties were kept. When the mass ratios of polyvinyl acetate to carbon materials were 1∶1 and 2∶1, the results of coating were excellent. Furthermore, the modified carbon nanomaterials possessed the perfect dispersity and stability.