不同石墨化程度碳纤维表面电化学氧化特征研究

对不同石墨化程度的碳纤维进行表面电化学氧化处理，利用XPS、Raman和XRD研究了其表面氧化的特征和规律性以及碳纤维表面结构变化对碳纤维电化学氧化行为的影响，利用层间剪切测试（ILSS）分析了不同石墨化程度碳纤维复合材料的界面性能。结果表明：碳纤维经电化学氧化后，表面O、C原子个数比有增大的趋势，随碳纤维石墨化程度的提高，其增大的幅度越来越小；相同电流密度下，随石墨化程度的提高，碳纤维表面对电化学氧化的反应性减弱；不同石墨化程度的碳纤维经电化学氧化后，表面化学官能团以及ILSS的变化趋势均不同。不同石墨化程度碳纤维表面碳结构状态的不同是造成这些变化的根本原因。

The character of electrochemically oxidized carbon fibers with different graphite structures

Carbon fibers with different graphite structures were electrochemically oxidized and XPS, Raman spectroscopy and XRD were used to study the surface oxidation character and regularity. The changes in surface structure, which caused different carbon fibers to show different electrochemical oxidation behavior, and the changes in interlaminar shear strength (ILSS) were also studied. The O, C ratio on the surface of the carbon fibers was found to increase after electrochemical treatment, but the increase in O, C ratio became less marked as the degree of graphitization of the carbon fibers increased. For the same current density, the O, C ratio decreased gradually with increasing degree of graphitization of the carbon fibers, while the number and identity of the surface chemical functional groups and the change in ILSS also varied. Detailed analysis showed that the different carbon structures in carbon fibers with different degrees of graphitization were responsible for these changes.