中国塑料2025，Vol.39Issue(9)：75-80,6.DOI:10.19491/j.issn.1001-9278.2025.09.012
高温外载作用下聚乙烯燃气管道老化行为研究
Aging behaviors of polyethylene gas pipeline under high temperature and external load
摘要
Abstract
In this study,the thermal oxidative aging behavior of polyethylene gas pipelines was investigated under com-bined high-temperature and mechanical loading conditions.A specialized experimental apparatus was developed to simu-late aging under these operational stresses.The effects of external loading on mechanical properties,microstructure,and thermal characteristics were systematically evaluated using tensile testing,scanning electron microscopy,Fourier-trans-form infrared spectroscopy,and differential scanning calorimetry.Results demonstrated that prolonged high-temperature exposure led to decreased elongation at break and reduced oxidation induction time,while increasing both carbonyl index and material crystallinity.Notably,applied external loads significantly accelerated the aging process.At a 1 000 N load,the aging rate increased by factors of 1.8(elongation),1.17(carbonyl index),and 1.3(oxidation induction time)com-pared to unloaded samples.These findings quantitatively established the synergistic degradation effects of thermal and mechanical stresses on pipeline polyethylene,providing critical insights for material service life prediction and mainte-nance strategies.关键词
燃气管道/高密度聚乙烯/外部载荷/热氧老化/老化速率Key words
gas pipelines/high-density polyethylene/external load/thermal-oxidative aging/aging rate分类
化学化工引用本文复制引用
徐锋,李英杰,杨居一,李旋,储成林..高温外载作用下聚乙烯燃气管道老化行为研究[J].中国塑料,2025,39(9):75-80,6.基金项目
江苏省特种设备安全监督检验研究院科技计划项目[KJ(Y)2023009] （Y）
