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基于聚醚酰亚胺优越的力学性能和纳米纤维膜高比表面积、高孔隙率的特性,利用气泡静电纺丝工艺制备不同厚度的纳米纤维膜改善碳纤维环氧复合材料的层间韧性。结果发现不同膜厚度增韧的双悬臂梁(DCB)试件的I型层间断裂值(GIC)均有所提高,特别是膜厚为0.058±0.007 mm时,层合板的增韧效果最好,比未增韧试件提高了114.55%。通过复合材料层间断裂界面的SEM照片证实了纳米纤维膜在界面处通过桥联约束效应及钉锚作用有效提高了复合材料的层间断裂韧性。
Based on the excellent mechanical properties of polyetherimide and the high specific surface area and high porosity of nanofiber membranes, nanofiber membranes with different thickness were prepared by bubble electrospinning to improve the interlaminar toughness of carbon fiber epoxy composites. The results show that I type interlaminar rupture value (GIC) of double cantilever beams (DCB) toughened with different film thickness increases, especially when the film thickness is 0.058 ± 0.007 mm, the toughening effect of the laminate is the best , Which is 114.55% higher than the non-toughened specimens. The interfacial fracture toughness of the nanocomposites was verified by the SEM images of interlaminar fracture interface of the composites through the bridging constraint effect and the anchor-anchor effect at the interface.