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通过扫描电子显微镜分析和树脂冲击性能测试,研究了聚醚砜(PES)对高温环氧树脂5284性能的影响及增韧机理,并基于“离位”增韧技术制备了具有增韧功能的ES-U3160织物.以ES-U3160织物作为增强体,采用树脂转移模塑成型(RTM)工艺制备了ES-U3160/5284复合材料,并对复合材料的韧性性能进行研究.结果表明:随着PES含量的增加,环氧树脂5284的冲击韧性大幅度提高;PES与5284树脂形成了双连续相结构,有效地阻止了裂纹的扩展,起到了增韧的作用.与未增韧复合材料相比,“离位”增韧ES-U3160/5284复合材料的I型层间断裂韧性(GⅠC)、Ⅱ型层间断裂韧性(GⅡC)及冲击后压缩强度(CAI)都有较大的提高.“,”The effect of PES on the properties of 5284 resin and the toughening mechanism were investigated by SEM and mechanical properties tests of resin.ES-U3160 fabrics with toughening function were prepared according to ex-situ toughening technology.ES-U3160/5284 composites were prepared by RTM process taking ES-U3160 fabrics as reinforcement,and the properties of toughness of composites were studied.The results showed that with the increase of PES content,the impact toughness of 5284resin was greatly improved.PES and 5284 resin formed a double continuous phase structure,which effectively prevented the crack propagation and played a role in toughening.GⅠC value,GⅡC value and CAI value of ES-U3160/5284 were greatly improved,compared with that of un-toughened composite.