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 hydro-thermal aging mechanism of glass fiber (GF)/epoxy composites,the effects of hydro-thermal aging on the properties of GF/epoxy 608 (EP608)composites were investigated by gravimetric method,dynamic mechanical analyzer (DMA),SEM and vector network dielectric analyzer firstly.Then,the rela-tionships between moisture absorption ratio,mechanical properties,dielectric properties and aging time of the com-posites were analyzed,and the aging mechanism was discussed.The results show that with aging time increasing, both of the mechanical properties and dielectric properties for GF/EP608 composites reduce in different degrees.The effect of hydro-thermal aging on the moisture absorption ratio of GF/EP608 composites accords with Fickian diffu-sion law.The plasticization,hydrolyzation of resin matrix and the failure of fiber-matrix interface are the main rea-sons for the decrease of the mechanical properties and dielectric properties for GF/EP608 composites.The conclu-sions obtained can provide scientific references for the application of GF reinforced epoxy matrix composites.
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