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- 2016
湿热老化对玻璃纤维/环氧树脂复合材料性能的影响
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Abstract:
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 relationships between moisture absorption ratio, mechanical properties, dielectric properties and aging time of the composites 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 diffusion law. The plasticization, hydrolyzation of resin matrix and the failure of fiber-matrix interface are the main reasons for the decrease of the mechanical properties and dielectric properties for GF/EP608 composites. The conclusions obtained can provide scientific references for the application of GF reinforced epoxy matrix composites.
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