采用循环伏安法,以己内酰胺为聚合单体对碳纤维进行电聚合改性.利用循环伏安特性曲线、傅里叶变换红外光谱、电脑伺服控制材料试验机、扫描电镜(SEM)研究了改性前后碳纤维及其复合材料表面结构与性能的变化.结果表明,当己内酰胺浓度为0.1 mol/L,循环次数为10次时,碳纤维的改性效果较佳;改性后的碳纤维在1650 cm-1出现NH2的变角振动吸收峰,1556 cm-1,1540 cm-1出现羧酸COO反对称伸缩吸收峰;能谱测试发现碳纤维表面O含量增加了1.69％;复合材料的层间剪切强度(ILSS)由10.50 MPa增加到26.96 MPa,提高了156.70％;SEM图表明改性后碳纤维表面生成分散均匀的颗粒且具有一定厚度的聚合物涂层,与复合材料结合紧密且无拔出现象.
The electropolymerizing caprolactam electrolyte with cyclic voltammetry onto carbon fibers was adopted.Cyclic voltammetry curves,FT-IR,computer servo control material testing machine,SEM were employed to characterize molecular structures and properties of untreated,various conditions treated carbon fibers and its composites surface.The results indicate that the optimum condition are obtained in the situation of 0.1 mol/L caprolactam electrolyte and cycling 10 times;the NH2 variable angle vibration absorption peak appears at 1650 cm-1,and COO antisymmetric stretching absorption peak appears at 1556 cm-1,1540 cm-1 in the infrared spectra;energy spectrum test results indicate that the O content of carbon fiber surface increases by 1.69 ％;the interlaminar shear strength(ILSS) of composites are increased by the rate of 156.70％,from 10.50 MPa to 26.96 MPa;SEM show that a certain thickness polymer layer with dispersed particles is performed onto the surface of carbon fibers,which combine with epoxy resin closely and the length of pull out fibers is vanished.
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