玻璃纤维增强环氧乙烯基酯树脂基复合材料的热老化性能

发布时间：2018-12-26 08:52

【摘要】：对玻璃纤维增强环氧乙烯基酯树脂基复合材料进行了高温老化试验,分析了随着老化时间的延长,材料的表面形貌、巴氏硬度及力学性能的演变规律,同时采用傅立叶变换红外光谱、X射线光电子能谱和扫描电子显微镜对老化前后复合材料的化学结构、表面元素含量及老化前后材料拉伸断面形貌变化进行了分析。结果表明,随着老化时间的增加,材料表面颜色不断加深,并出现龟裂和翘曲变形以及纤维凸出在表面;巴氏硬度保留率随着老化时间的延长呈现先增大后减小的趋势,在老化28 d时,巴氏硬度保留率下降4.3%;试样的拉伸强度保留率和弯曲强度保留率随着老化时间的延长,呈现先增大后缓慢降低的趋势,在老化28 d时分别下降6.14%和9.23%;试样在老化过程中没有新的物质生成,但其化学元素含量发生了变化,说明了复合材料发生了化学反应,其化学结构发生了变化;试样表面树脂脱落面积和空隙量逐渐增多;经过高温老化后的试样拉伸断裂后,整体断面形貌不规则,并且随着老化时间的增加,树脂含量逐渐减少。
[Abstract]:The aging test of glass fiber reinforced epoxy vinyl ester resin composites at high temperature was carried out. The evolution of surface morphology, pasteurization hardness and mechanical properties of glass fiber reinforced epoxy vinyl ester composites with aging time was analyzed. At the same time, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and scanning electron microscope were used to analyze the chemical structure, surface element content and tensile section morphology of the composite before and after aging. The results show that with the increase of aging time, the surface color of the material becomes more and more intense, and there are cracks and warpage and the fibers protrude on the surface. The retention rate of pasteurized hardness increased first and then decreased with the aging time. After 28 days of aging, the retention rate of pasteurized hardness decreased 4.3%. The retention rate of tensile strength and flexural strength of the sample increased first and then decreased slowly with the aging time, and decreased by 6.14% and 9.23% after 28 days of aging, respectively. There was no new material formation in the sample during aging, but the chemical element content of the sample changed, which indicated that the chemical reaction took place, the chemical structure of the composite material changed, and the area of resin falling off and the amount of voids on the surface of the sample increased gradually. After the tensile fracture of the samples aged at high temperature, the morphology of the whole section is irregular, and the resin content decreases gradually with the increase of aging time.
【作者单位】：新疆大学机械工程学院;
【基金】：国家自然科学基金项目(51465055) 国家重点实验室开放课题(Sklms2014005) 新疆维吾尔自治区自然科学基金项目(2014211A010)
【分类号】：TB332;TQ327.1

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