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采用尼龙无纺布(PNF)作为结构化增韧层,利用树脂传递模塑(RTM)工艺制备了PNF层间增韧改性的碳纤维增强环氧树脂基复合材料(U3160-PNF/3266),研究了U3160-PNF/3266复合材料的吸湿特性及湿热老化对其耐热性能的影响。结果表明:增韧前后复合材料具有相似的吸湿动力学特性,但在吸湿初期,U3160-PNF/3266复合材料具有更大的吸湿速率,达到饱和吸湿后,U3160-PNF/3266复合材料的饱和吸湿率约为0.96%,略大于非增韧复合材料U3160/3266的0.87%。随着湿热老化时间的增加,两种复合材料的玻璃化转变温度均逐渐降低,并随着吸湿率的饱和而趋于平稳,达到饱和吸湿后,U3160-PNF/3266和U3160/3266复合材料的玻璃化转变温度分别下降了约15%和14%。
Nylon non-woven fabric (PNF) was used as the structural toughening layer. Carbon fiber reinforced epoxy resin matrix composites (U3160-PNF / 3266) modified by interlayers of PNF were prepared by resin transfer molding (RTM) The hygroscopic property of U3160-PNF / 3266 composites and the effect of heat and moisture aging on their heat resistance were studied. The results show that the composites have similar hygroscopic dynamic characteristics before and after toughening. However, U3160-PNF / 3266 composites have a higher moisture absorption rate at the initial stage of hygroscopicity. After saturated moisture absorption, the saturated hygroscopicity of U3160-PNF / 3266 composites The rate is about 0.96%, slightly larger than 0.87% of the non-toughened composite U3160 / 3266. With the increase of heat and moisture aging time, the glass transition temperature of the two composites decreased gradually and stabilized with the moisture absorption rate. After saturated moisture absorption, the glass transition temperature of U3160-PNF / 3266 and U3160 / 3266 composites Glass transition temperature decreased by about 15% and 14% respectively.