中文摘要：

冷场发射扫描电镜表明,固化5228A/PAEK共混体系发生了反应诱导相分离,相形貌依次经历了海岛-双连续-相反转的演化过程;DMA试验表明,PAEK的引入对5228A基体树脂Tg略有影响,但基本不会改变原有树脂体系的使用温度;T800/5228A经韧化后,在层间内形成了典型的相反转结构,裂纹扩展路径呈现出波纹状,明显区别于原有的光滑平直裂纹路径,Ⅰ型层间断裂韧度（GIC）大幅度提高。

英文摘要：

Reaction induced phase separation takes place in 5228A/PAEK compound cure process,and cured phase microstructure experiences sea-isaland-cocontinue-phase separation transition accompany PAEK content arising.Further DMA test shows that PAEK induced lowers glass transition temperature of neat 5228A matrix resin in some degree,but does not change its applied temperature.Mode I fracture tougheness shows that the spread route of crack of toughened T800/5228A composite laminate presents wave-like characterization,differring from smoothly stright feature for original composite,since phase separation microstructure in toughened composite enforces crack lip unceasingly adjusting orientation in PAEK phase of high tougheness when confronting 5228A microstructure ball,therefore mode Ⅰ fracture tougheness ascends greatly.