BN粒子改性PVDF电纺纤维膜插层增强碳纤维/环氧树脂复合材料层间韧性OA北大核心

To address the problem of delamination damage in fiber reinforced composite laminate,an interlea-ving method of boron nitride(BN)particle-modified electrospun polyvinylidene fluoride(PVDF)fibrous was pro-posed to improve the interlaminar fracture toughness of carbon fiber/epoxy(CF/EP)composite laminate.The BN was first uniformly dispersedin PVDF solution by ultrasonic treatment,then BN-modified PVDF fibrous(BN&PVDF)was prepared using an electrospinning method and introduced into the interlayer of carbon fibres as an intercalation material,and BN&PVDF reinforced CF/EP composite laminates(BN&PVDF-CF/EP)were prepared by manual lay-up method and vacuum hot-pressing process.The study focused on the effect of BN particle content in modified PVDF electrospun fibrous on the reinforcement of CF/EP interlaminar fracture toughness and the relevant interlami-nar toughening mechanism.The results show that the modified PVDF electrospun fibrous with a BN content of 3.2wt％have achieved the best toughening effect.The mode Ⅰ and Ⅱ interlaminar fracture toughness of BN&PVDF-CF/EP are increased by 129.6％and 160.6％,respectively,compared to that of CF/EP.The introduction of the BN parti-cles increases the tensile strength and modulus of the PVDF fibers.The BN particles areembedded in the PVDF fi-bers and increase the roughness of the PVDF surface,which enhances the interfacial interaction between the PVDF fibers and the matrix,inducing a more complex toughening behavior and improving the toughening effect of the PVDF fibers.