Outdoor weathering behavior of polyamide 6 under various climates in China
Outdoor weathering behavior of polyamide 6 under various climates in China
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DOI：
10.1002/app.44231
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发表时间：
2017-01
影响因子：
3
通讯作者：
K. Shi;Li-ping Gao;Y. Tao;L. Ye;Guang-xian Li;G. Jie
中科院分区：
文献类型：
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作者：
K. Shi;Li-ping Gao;Y. Tao;L. Ye;Guang-xian Li;G. Jie
在琼海、广州、青岛、拉萨、海拉尔和若羌6个国家标准自然暴露站（代表中国6个典型气候）对聚酰胺6（PA6）进行了室外自然老化试验。研究了其户外老化行为。结果表明，在广州、琼海、青岛等地区高温高湿条件下，PA6的端羧基浓度显著增加，分子量下降，水解降解严重。这导致了机械性能的劣化、高泛黄度和样品表面的严重损伤。而在拉萨、若羌等地区，由于气温、湿度、大气含氧量相对较低，老化程度和腐蚀指数较低，导致性能变化缓慢。湿度、温度和降雨量可能是影响PA6降解的主要环境因素。© 2016 Wiley Periodicals，Inc. J.应用聚合物Sci. 2017，134，44231。
The outdoor natural weathering of polyamide 6 (PA6) was performed at six national standard natural exposure stations (at Qionghai, Guangzhou, Qingdao, Lhasa, Hailaer, and Ruoqiang), which represented the six typical climates over China. The outdoor aging behavior was studied. We found that under high temperature and humidity in the areas of Guangzhou, Qionghai, and Qingdao, the concentration of the end carboxyl group of PA6 increased significantly and the molecular weight decreased because of serious hydrolytic degradation. This resulted in a deterioration of the mechanical properties, high yellowing degree, and serious damage of the sample surface. While in the areas of Lhasa and Ruoqiang, with the relatively low temperature, humidity, and oxygen content in the atmosphere, the aging degree and corrosion index were low, and this resulted in the slow change of performances. Humidity, temperature, and rainfall may be the main environmental factors affecting the degradation of PA6. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44231.