高性能聚醚醚酮紫外光加速老化行为研究

目的 研究特种工程塑料聚醚醚酮(PEEK)在紫外光照射实验室加速条件下的老化行为。方法 对PEEK塑料采取紫外线光老化方式进行试验，对老化前后的样品进行外观变化、力学性能、热性能、微观结构表征与分析，明确紫外环境因素对材料的性能影响，进而确定PEEK塑料在紫外光条件下的老化行为。结果 随着紫外光老化时间的增加，PEEK样品表面变黄，颜色加深，出现鼓包与裂纹等宏观与微观损伤。样品内部力学性能、热性能、红外特征吸收峰、元素含量与价态没有明显变化，样品表面热性能下降，傅里叶变换衰减全反射红外光谱(ATR-FTIR)特征吸收峰变化明显。结论 PEEK塑料表面对紫外光比较敏感，在紫外光的照射下容易发生表层的分解，短时间内不会引起材料整体热性能及力学性能的明显变化。

Accelerated Aging Behavior of High Performance Polyether Ether Ketone Plastics

The work aims to study the aging behavior of special engineering plastic polyether ether ketone (PEEK) in ultraviolet irradiation. The PEEK plastic was tested by ultraviolet light accelerated aging. Appearance change, mechanical properties, thermal properties, and microstructure of aged samples were analyzed and characterized to determine the effect of ultraviolet irradiation environment factors on material properties and further determine the aging behavior of the PEEK plastic in ultraviolet irradiation. With the increase of the ultraviolet aging time, various changes happened to PEEK sample, including surface turning yellow, darken color, bulge and crack appearing. Meanwhile, the mechanical and thermal properties, infrared characteristic absorption peak, element content and valence state in the PEEK sample did not show significant changes. The thermal properties on the sample surface reduced. There was apparent change in the characteristic absorption peak of the Attenuation Reflectance Fourier Transformation Infrared Spectrometry (ATR-FTIR). The above results demonstrate that PEEK was sensitive to ultraviolet radiation. It is likely to suffer from surface decomposition in ultraviolet radiation. But it would not cause apparent change in overall mechanical and thermal properties of the material in a short period.