The polymer with semi-IPN structure was prepared by blending epoxy resin(EP) with phenolphthalein poly(ether ketone)(PEK-C) using cyanate eater resin(CE) as curing agent.The mechanical properties including fracture toughness,flexural module and flexural strength were tested by three-point bending method.The glass transition temperature(Tg) and storage module were tested by dynamic mechanical analysis(DMA).And the morphology of the fracture surface was observed by scanning electron microscopy(SEM).The result...