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采用光泽度、扫描电镜和傅里叶变换红外分析技术等研究了三元乙丙橡胶(EPDM)在西沙大气暴晒和室内加速老化试验条件下的表观形貌及结构的变化,探索了室内外老化表观性能的相关性.结果表明:盐雾试验条件下光泽度基本没有变化;荧光紫外试验中光泽度在开始阶段就快速下降,最后趋于平稳;在西沙大气暴晒条件下,初始阶段变化趋势并不明显,随着老化时间的增加,光泽度值下降.紫外-盐雾复合循环试验条件下光泽度变化趋势与西沙大气条件下相似,说明西沙大气暴晒试验和紫外-盐雾复合循环试验具有很好的相关性,基于光泽度分析,紫外-盐雾复合循环试验的加速倍数是25～26.红外光谱显示在西沙大气暴晒试验和紫外-盐雾复合试验中可能有β-二酮的生成,盐雾试验条件下没有β-二酮的生成.
The changes of apparent morphology and structure of EPDM under exposure to Xisha atmosphere and indoor accelerated aging test were studied by means of glossiness, scanning electron microscopy and Fourier transform infrared spectroscopy, The results showed that there was almost no change in gloss under the salt spray test conditions. In the UV-Vis test, the glossiness decreased rapidly at the beginning and finally stabilized. Under the conditions of atmospheric exposure to Xisha, the initial stage changed The trend is not obvious, with the increase of aging time, the gloss value decreases.Ultraviolet-salt fog composite cycle test conditions the trend of gloss change is similar to that of Xisha atmospheric conditions, indicating Xisha atmospheric exposure test and UV-salt spray composite cycle test Has a good correlation, based on the gloss analysis, UV - salt spray composite cycle test accelerated multiples of 25 to 26. Infrared spectroscopy showed that the Xisha atmospheric exposure test and UV - salt spray composite test may have β-diketone Generation, salt spray test conditions without the formation of β-diketone.