玻璃纤维增强环氧树脂基复合材料在温湿和紫外辐照环境中的老化行为

Aging Behavior of Glass Fiber Reinforced Epoxy Resin Composite in Warm-Wet and Ultraviolet Irradiation Environment

在温湿和紫外辐射环境中对玻璃纤维增强环氧树脂基复合材料进行加速老化试验,采用红外光谱仪、X射线光电子能谱仪、扫描电镜、热重分析仪、力学试验机等研究了老化前后复合材料的化学结构、表面元素含量、表面形貌、玻璃化转变温度、弯曲和拉伸性能。结果表明:在温湿和紫外辐照环境中老化1 440h后,复合材料树脂中存在化学键断裂的现象,化学结构发生了改变,树脂发生了光氧化反应;随着老化时间的延长,复合材料表面出现变色、龟裂、翘曲变形等现象,老化1 440h后表面呈片层状海浪花样;随着老化时间的延长,复合材料的强度和模量均呈先增后降的趋势,并均在老化160h时达到最大;老化1 440h后,复合材料的初始分解温度比老化前的低,玻璃化转变温度约为113.4℃,比老化前的升高了8℃。

Accelerated aging test was conducted on glass fiber reinforced epoxy resin composite in warm-wet and ultraviolet irradiation environment.The chemical structure,surface element content,surface morphology,glass transition temperature,and bending and tensile properties of the composite were studied by infrared spectrometer,X-ray photoelectron spectrometer,scanning electron microscope,thermal gravimetric analyzer and mechanical testing machine.The results show that in the warm-wet and ultraviolet irradiation environment,the rupture of chemical bond occurred in the resin of composite after aging for 1 440 h,the chemical structure changed and the resin went through the photo-oxidation reactions.With aging time increasing,the surface of composite showed discoloration,cracking and warping deformation features.After aging for 1 440 h,a laminar wave pattern was observed on the surface.With the increase of aging time,the strength and modulus of the composite both increased first and then decreased,and reached the maximum values after aging for 160 h.After aging for 1 440 h,the initial decomposition temperature of the composite was lower than that before aging,the glass transition temperature was about 113.4 ℃,which was 8 ℃ higher than that before aging.