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 玉
fracture tougheness ascends greatly.