Abstract: In this paper,the effects of different temperatures, pressures, cooling rates, and interfacial modification on the fracture toughness of type I interfacial of carbon fiber reinforced polyphenylene sulfide(CF/PPS) aeronautical thermoplastic composites were investigated. At higher molding temperature (340 ℃), fast cooling rate (32 ℃/min), and interfacial modification, CF/PPS composites exhibit higher G_ⅠC value. The higher temperature favors the entanglement of the intermolecular matrix chains. The faster cooling rate suppresses the crystallization and makes the matrix tougher. The CF interfacial modification improves the interfacial interaction between the fiber and the matrix resin, which is beneficial to stress and energy transfer. This paper has reference value for the preparation and application of aeronautical thermoplastic composites. The effect of pressure on the G_ⅠC of CF/PPS is not obvious. Higher molding pressure will cause the resin to impregnate the fibers weakly, and a large amount of resin will overflow from the gap between the mold edges, which is not conducive to the improvement of the toughness of the composite material.

Key words: thermoplastic composites, polyphenylene sulfide, fracture toughness, molding processing, inter-face modification