碳纤维在不同电解质体系下的电化学表面改性

Electrochemical surface treatment and of PAN-based carbon fibers in different electrolyte solutions

使用电化学氧化法对PAN基碳纤维进行表面改性,通过扫描电子显微镜(SEM)、Raman光谱和X射线光电子能谱仪(XPS)表征了碳纤维表面物理化学结构,同时结合力学性能分析,评价了碳酸氢铵、硫酸铵和复合铵盐溶液3种电解质体系的改性效果。实验结果表明,碳酸氢铵溶液下的电化学改性有利于界面粘结强度的提高,而硫酸铵溶液下的电化学改性有利于降低抗拉伸强度的损失,当采用复合溶液改性时,则可以同时提高碳纤维的抗拉伸强度和其复合材料的抗层间剪切强度。

PAN-based carbon fibers （CFs） were continuously treated using electrochemical oxidation method in different electrolyte systems. SEM, Raman and XPS were used to characterize the physical and chemical structure of CF surface. With mechanical analysis, NH4HCO3, （NH4）2SO4 and their electrolyte solution compound were evaluated in terms of their effects on the surface chemistry and structure of CFs. The results showed that electrochemical surface treatment in NH4HCO3 solution was helpful to improving the interface bond strength, while electrochemical surface treatment in （NH4）2SO4 solution could reduce the loss of tensile strength. When electrolyte solution compound employed, tensile strength and interface bond strength of CFs were improved simultaneously.