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采用单丝复合体系多次断裂法,通过对纤维单丝断点数的统计及其断点形貌的分析,考察了PBO纤维、芳纶Twaron纤维、超高分子量聚乙烯纤维(UHMWPE)3种高性能有机纤维与韧性环氧基体的界面剪切强度;并对比考察了界面剪切强度与对应复合材料单向板层间剪切强度之间的关系;结合XPS、SEM等手段分析了有机纤维表面物理化学特性对界面剪切强度的影响。结果表明,Twaron/环氧的界面剪切强度高于PBO/环氧,UHMWPE/环氧的界面粘结弱,该方法不能测试;上述体系界面剪切强度与对应的复合材料单向板层间剪切强度变化趋势是一致的;表面化学活性高的纤维对应的界面剪切强度高。
By means of the multi-fracture method of monofilament composite system, three types of high fiber such as PBO fiber, Twaron fiber, ultra-high molecular weight polyethylene fiber (UHMWPE) were investigated through the statistics of the number of break points and breaking point morphology. The interfacial shear strength between the organic fiber and the ductile epoxy matrix was investigated. The relationship between the interfacial shear strength and the interlaminar shear strength of the composites was also investigated. By means of XPS and SEM, Effect of Physical and Chemical Properties on Interfacial Shear Strength. The results show that the interfacial shear strength of Twaron / epoxy is higher than that of PBO / epoxy, and the interfacial adhesion of UHMWPE / epoxy is weak. This method can not be tested. The interfacial shear strength of the above- The trend of shear strength is consistent; the high chemical activity of the surface of the fiber corresponding to the high shear strength of the interface.