摘要
本文研究通用不饱和聚酯树脂人工加速老化失效机理。对通用不饱和聚酯浇注体试样进行了人工加速热氧老化及人工加速氙灯老化试验,用显微镜观察了试样的外观形貌,测试了试样的拉伸强度和弯曲强度,对试样进行了动态力学性能分析(DMA)分析,用FT-IR分析了树脂化学基团的变化。研究表明:不饱和聚酯在老化早期有后固化现象,随着加速老化时间的延长,试样表面出现裂纹并逐渐增加,而拉伸强度,弯曲强度和玻璃化转变温度(T_g)均降低;人工加速氙灯老化所造成的失效比热氧老化要严重得多。分析表明紫外线是造成不饱和聚酯的老化失效的主要影响因子。
Artificial accelerated aging behavior and mechanism of the universal unsaturated polyester resin were studied. Artificial accelerated aging tests of universal unsaturated polyester samples were carried out by means of xenon arc lamp and thermo-oxidation： Then the appearances of the samples were inspected by microscopy, and the tensile strength and bending strength were tested. Finally, dynamic mechanical analysis （DMA） was carried out, and the change of radicals of the resin was analyzed by FF-IR. The results show that post cure occurred to the unsaturated polyester at the initial stage of aging. With aging time going, there were more and more cracks at the surface of the samples ; the tensile strength, bending strength and glass transition temperature declined. The failure caused by xenon arc lamp aging is much more serious than that caused by thermo-oxidation aging. It is concluded that the main influencing factor leading to the failure of the unsaturated polyester is ultraviolet ray. Key words：
出处
《失效分析与预防》
2009年第2期65-70,共6页
Failure Analysis and Prevention
基金
国家自然基金重点项目(50533060)
关键词
人工加速热氧老化
人工加速氙灯老化
紫外线
失效
玻璃化转变温度
artificial thermo-oxidation aging
artificial xenon arc lamp aging
failure
ultraviolet （UV） ray
glass transition temperature （Tg）
