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为研究玻璃纤维(GF)/环氧树脂复合材料湿热老化机制,首先,利用称重法、动态热机械分析仪(DMA)、SEM和矢量网络介电分析仪研究了湿热老化对GF/环氧树脂608(EP608)复合材料性能的影响;然后,分析了复合材料的吸湿率、力学性能、介电性能与老化时间的关系,并对其老化机制进行了探讨。结果表明:随老化时间延长,GF/EP608复合材料的力学性能和介电性能均有不同程度的下降;湿热老化对GF/EP608复合材料吸湿率的影响符合Fickian扩散定律;树脂基体的塑化、水解和基体-纤维界面的破坏是造成GF/EP608复合材料力学性能和介电性能下降的主要因素。所得结论可为GF增强环氧树脂基复合材料的应用提供科学依据。
In order to study the mechanism of damp-heat aging of glass fiber (GF) / epoxy composites, the effects of wet heat aging on the properties of GF / epoxy were investigated by means of weighing, dynamic thermomechanical analyzer (DMA), SEM and vector network dielectric analyzer Resin 608 (EP608) composites. Then, the relationship between moisture absorption, mechanical properties, dielectric properties and aging time of composites was analyzed. The aging mechanism was also discussed. The results show that the mechanical properties and dielectric properties of GF / EP608 composites decrease with the aging time. The effect of aging on the moisture absorption of GF / EP608 complies with Fickian diffusion law. The plasticization, Hydrolysis and matrix - fiber interface damage is caused by the GF / EP608 composite mechanical properties and dielectric properties of the main factors. The conclusions can provide a scientific basis for the application of GF reinforced epoxy resin matrix composites.