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采用正压过滤法制备了不同厚度的多壁碳纳米管(Multi-walled carbon nanotubes,MWNTs)网格,并将制得的MWNTs网格并入碳纤维层合板的层间界面,研究了网格对层合板II型层间断裂韧性(G_(IIC))和层间剪切强度(ILSS)的影响.结果表明,约20!m厚的多孔MWNTs网格使复合材料的G_(IIC)和ILSS分别提高了约69%和24%.微观断面表明,连续的纳米网格显著提高了碳纤维和树脂基体的界面粘接性能,在剪力作用下,从典型的树脂脆性断裂以及纤维-树脂界面脱粘过渡到MWNTs增强树脂区域内的韧性断裂,一定厚度的MWNTs网格对层间区域起到了良好的增韧效应.
Multi-walled carbon nanotubes (MWNTs) meshes with different thicknesses were prepared by using positive pressure filtration method. The meshed MWNTs were incorporated into the interlayer interface of carbon fiber laminates. (IIC) and interlaminar shear strength (ILSS) of laminate II.The results show that the grids of porous MWNTs with a thickness of about 20 μm make the GIC and ILSS of the composites Increased by about 69% and 24%, respectively.Microscopic cross-sections showed that the continuous nano-grid significantly enhanced the interfacial adhesion between the carbon fiber and the resin matrix, under the shear force, from the typical brittle fracture of the resin and from the fiber- The transition to MWNTs enhances the ductile fracture in the resin region, and a certain thickness of the MWNTs grid has a good toughening effect on the interlayer region.