Abstract: In this paper, the prepreg of continuous carbon fiber reinforced poly(phthalazinone ether sulfone ketone) resin matrix composites (CF/PPESK) was prepared using the solution impregnation method. Through an orthogonal test, the concentration of the impregnating solution and process parameters for prepreg-making equipment were optimized. When the concentration of impregnating solution is 20wt%, the roller speed is 7 r/min and the strip width is 6.5 mm, the resin volume content and areal density of the prepreg are 40.01% and 218 g/m², respectively. CF/PPESK were prepared by hot pressing, the defects and properties of isotropic (QI) composite laminates under different forming processes were investigated, by the ultrasonic phased array and three-point flexural test. The results show that the defect of QI laminates is the least, the flexural strength and modulus are 345 MPa and 46 GPa, when the molding temperature and pressure are 350 ℃ and 16 MPa, respectively. The flexural strength retention rate of composite laminates with different lay-up structures are 60%~62% at 250 ℃. In order to improve the flexural strength of CF/PPESK@QI composite laminates, by MWCNTs-P is blended with PPESK resin matrix, the flexural strength of laminates with different lay-up structures could be improved by 39%~46%, At 250 ℃, the flexural strength retention rate of composite laminates with different lay-up structures are 47%~52%.

Key words: thermoplastic polymer composite, poly(phthalazinone ether sulfone ketone), mechanical property, lay-up structure, molding process