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采用尼龙无纺布(PNF)作为结构化增韧层,制备了PNF层间增韧改性的U3160碳纤维增强3266环氧树脂(U3160-PNF/3266)复合材料,研究了U3160-PNF/3266复合材料的面内力学性能及湿热老化后的力学性能变化,并分析了复合材料湿热老化前后的层间形貌。结果表明:PNF增韧层的引入并未导致复合材料面内力学性能的下降,与未增韧的U3160碳纤维增强3266环氧树脂(U3160/3266)复合材料相比,增韧复合材料U3160-PNF/3266的90°拉伸性能有所提高。而湿热老化处理对U3160-PNF/3266复合材料的基体和界面性能影响相对明显,尤其是尼龙纤维与树脂基体之间的界面结合性能,湿热老化处理后增韧复合材料的90°压缩和层间剪切性能保持率均明显低于未增韧复合材料的。
The U3160 carbon fiber reinforced 3266 epoxy resin (U3160-PNF / 3266) composite modified by toughening of PNF was prepared by using nylon non-woven fabric (PNF) as structured toughened layer. The effects of U3160-PNF / 3266 composite The in-plane mechanical properties of the material and the change of the mechanical properties after the heat and moisture aging, and the interlayer morphology before and after the composite material is analyzed. The results show that the introduction of toughening layer of PNF does not lead to the decrease of in-plane mechanical properties of composites. Compared with U3160 carbon fiber reinforced 3266 epoxy resin (U3160 / 3266), toughening composites U3160-PNF / 3266 90 ° tensile properties have improved. However, the effects of heat and moisture aging on the matrix and interfacial properties of U3160-PNF / 3266 composites are relatively obvious, especially the interfacial bonding between nylon fibers and resin matrix. The 90 ° compression of the toughening composites after wet-heat aging treatment and the inter- Shear performance retention rates were significantly lower than the non-toughened composites.