几种高性能纤维的表面性能及其对界面粘接的影响

Surface performance and effects on interfacial adhesion of several high performance fibers

分别使用扫描电镜和X射线光电子能谱仪,对T 800炭纤维、F 12有机纤维及新型超高强度PBO纤维(聚对苯撑苯并双唑)进行了物理与化学表征和分析,用SEM观察得出这三种纤维表面物理形态差别清晰可见,T 800纤维表面沟槽深且直径小,PBO纤维表面极光滑且直径中等,F 12纤维直径最大且表面有微小沟槽。XPS定量分析表明,这三种纤维表面活性也不一样,T 800纤维表面活性较多,PBO纤维表面活性最差。纤维表面状态的差异体现在它们与树脂复合后的材料界面粘接性能上,T 800纤维的界面剪切强度(IFSS)高,F 12纤维次之,PBO纤维最差。

Using scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), the surface physical and chemical characterization of T-800 carbon fiber, F-12 aramid fiber and the poly (p-phenylene benzobisoxazole) fiber (PBO) were conducted. SEM observation reveals their different physical surface distinctly. Some deep grooves exist on surface of T-800 fiber with the smallest diameter, surface of PBO fiber with medium diameter is very slippery, and shallow grooves exist on surface of F-12 fiber with the biggest diameter. XPS quantitative analysis shows that three kinds of fiber surface activity are different evidently. There are more active groups on T-800 fiber surface, but few active groups on PBO fiber surface, so its surface is inactive. These discrepancies in fiber surface activity of T-800, F-12 and PBO lead to the differences in the mechanical adhesive property of composite interface. The interfacial shear strength (IFSS) of T-800 fiber is higher than that of F-12 fiber and IFSS of PBO fiber is the lowest.