紫外线对玻纤环氧乙烯基酯树脂基复合材料性能的影响

对玻璃纤维增强环氧乙烯基酯树脂基复合材料在温湿环境下进行了人工紫外加速老化实验,并进行了拉伸、弯曲等试验,分析了试件紫外老化后的质量损失率、巴氏硬度、弯曲破坏形态以及力学性能的演变规律,并利用SEM观察了试样表面老化前后的形貌变化.研究表明:紫外线照射后试样的表面泛黄,且随照射时间的延长颜色不断加深;试样拉伸和弯曲性能以及巴氏硬度在紫外老化前期有所上升,160 h后开始下降;质量损失率随着紫外光照射时间的延长而逐渐增大;紫外老化后试件的弯曲破坏过程与未老化试件一致;随着老化周期的增加,孔隙量和韧性发白光带数量增加,呈现出明显的片层状海浪花样.

Effects of UV on the properties of glass epoxy vinyl resin-based composites

Artificial UV accelerated aging test in this artificial environment with certain temperature and humidity was done with glass fiber reinforced epoxy vinyl ester resin composite, and then the tensile and bending test were also done with the extension of UV irradiation time. The evolvement rules of mass loss rate, Barcol rigidity, flexural failure structure, mechanical property after aging were analyzed, and the morphological changes of the samples were observed by SEM. The results showed that the sample surface was turning yellow, and darkedn with time; the tensile and bending properties and Barcol rigidity were upward at the early stage of UV exposure,and then declined after 160 h. The failure pattern of tensile and bending after aging is consistent with those of the unaged samples.The mass lose rate of material declined with the time of UV exposure. SEM images showed that with the increase of the aging time, cavity density and tenacity white stripe with was increasing, which also is the obvious slice layer of wave pattern.