Performance of Interlayer Toughened Carbon Fiber/Epoxy Composites of Polyethersulfone Porous Fiber Veil
In order to improve the interlaminar toughness of carbon fiber/epoxy(CF/EP)composites,polyethersulfone(PES)porous fibers were prepared by wet spinning,and four PES porous fiber veils(PESV)with different areal densities were prepared by wet-laid method,which were subsequently used for interlaminar toughening of CF/EP composites by vacuum-assisted resin infusion molding(VARI).The dissolution behavior of PES porous fibers in epoxy resin,the mode Ⅰ(GⅠC)and mode Ⅱ(GⅡC)interlaminar fracture toughness,the interlaminar shear strength and flexural properties of the composites were sys-tematically examined,and the interlaminar fracture microscopic morphology of the composites was also characterized.The results showed that the PES porous fibers were completely dissolved in the epoxy res-in at the curing temperature of 180℃;The GⅠC and GⅡC of CF/EP composites were best at the areal densi-ty of 31.6 g/m2,which increased by 54.4％and 62.2％,respectively,which may be ascribed to that the phase separation of PES porous fibers dissolved in epoxy resin resulted in a two-phase PES/epoxy struc-ture,thereby,improved the interlayer toughness;The interlaminar shear strength,flexural strength and flexural modulus of CF/EP composites also increased by 2.9％,4.0％and 7.7％,respectively,for the areal density of 21.9 g/m2.
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