自然日光气候对燃气用聚乙烯管材拉伸性能和微观结构的影响  

The Infuence of Sunlight on the Tensile Properties and Microstructure of Polyethylene Pipes forGaseous Fuels

作　　者：肖潇 陈桓 林文进 王涛 XIAO Xiao;CHEN Huan;LIN Wen-jin;WANG Tao(Fujian Inspection and Research Institute for Product Quality,National Quality Inspection Testing Center of Plastic Product(Fuzhou),Fuzhou 350002,Fujian,China)

机构地区：[1]福建省产品质量检验研究院,国家塑料制品质量检验检测中心(福州),福建福州350002

出　　处：《合成材料老化与应用》2024年第6期24-26,40,共4页Synthetic Materials Aging and Application

基　　金：福建省市场监督管理局科技项目(FJMS2021004)。

摘　　要：通过傅里叶变换红外光谱分析、差示扫描量热法、拉伸性能测试等技术研究了燃气用聚乙烯管材在自然日光气候条件下的拉伸性能和微观结构的变化情况。结果表明,燃气用聚乙烯管材受到太阳辐射,会吸收光能,加速断链、氧化等反应,生成了不饱和双键及羰基、羟基等含氧基团。此外,受扩散限制氧化影响,管材暴晒表面氧化诱导时间减少最快,向阳暴晒部位的管材断裂伸长率下降最严重,但拉伸屈服应力变化不大。The tensile properties and microstructure changes of polyethylene pipes for gaseous fuels after sunlight aging were studied through Fourier transform infrared spectroscopy analysis,differential scanning calorimetry,and determination of tensile properties.The results showed that polyethylene pipes for gaseous fuels absorbed solar radiation,accelerated reactions such as chain breakage and oxidation,and generated unsaturated double bonds and oxygen-containing groups such as carbonyl and hydroxyl groups.In addition,due to diffusion limited oxidation,the oxidation induction time for surface of pipes exposed to sunlight decreased the fastest,and the fracture elongation of pipes exposed to sunlight decreased the most severely,with little change in tensile yield stress.

关 键 词：燃气用管材 聚乙烯 自然日光 拉伸性能 微观结构 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]