偶联剂处理镀镍碳纤维/环氧树脂界面特性

Effect of coupling treatment on the interface characteristic of nickel plating carbon fiber/resin

采用硅烷偶联剂KH560对镀镍碳纤维进行偶联处理。通过扫描电镜、红外光谱、接触角测量和单丝复合体系多次断裂法测试研究对比偶联处理前后碳纤维的表面形貌、结构、润湿性能以及纤维/树脂体系的界面状态和粘结性能。结果显示:偶联处理后,镍镀层表面平整,羟基等表面极性基团增加,表面涂覆的KH560膜层完整;镀镍碳纤维/树脂界面的浸润性得到改善;镀镍碳纤维/环氧树脂的界面处没有气泡产生,断点两侧的脱粘现象减轻;单丝饱和断点数由46增加到65;镀镍碳纤维/环氧树脂的界面剪切强度由(34.87±2.23)MPa提高到(72.51±3.77)MPa。

The nickel plating carbon fibers were modified by the coupling agent KH560. The surface morphology, structure, wettability of fiber, as well as the surface state and adhesive interaction of fiber/resin before and after the coupling treatment were characterized by SEM, FTIR, contact angle measurement and single fiber fragmentation test, respectively. The results show that the surface of nickel layer is flat, polar groups such as hydroxyl increases and the film on surface of nickel layer is intact after the coupling treatment of KH560. The wettability of nickle plating carbon fiber/resin is improved. There is no bubble on the interface of nickel plating carbon fiber/resin. The interface debonding on both sides of breakpoints decreases. The saturation breakpoints of single fiber increase from 46 to 65. The interracial shear strength of nickel plating carbon fiber/resin increases from （34.87±2.23） MPa to （72.51±3.77） MPa.