中国塑料 ›› 2025, Vol. 39 ›› Issue (9): 75-80.DOI: 10.19491/j.issn.1001-9278.2025.09.012

• 加工与应用 • 上一篇    下一篇

高温外载作用下聚乙烯燃气管道老化行为研究

徐锋1,2(), 李英杰1,2, 杨居一3, 李旋3, 储成林3()   

  1. 1.江苏省特种设备安全监督检验研究院泰州分院,江苏 泰州 225300
    2.江苏省仓储装备质量监督检验中心,江苏 泰州 225300
    3.东南大学材料科学与工程学院,南京 211189
  • 收稿日期:2024-10-11 出版日期:2025-09-26 发布日期:2025-09-22
  • 通讯作者: 储成林(1972-),教授,主要研究方向为材料研发及检测技术,clchu@seu.edu.cn
    E-mail:490910632@qq.com;clchu@seu.edu.cn
  • 作者简介:徐锋(1977-),高级工程师,主要研究方向为特种设备检验检测,490910632@qq.com
  • 基金资助:
    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]

Aging behaviors of polyethylene gas pipeline under high temperature and external load

XU Feng1,2(), LI Yingjie1,2, YANG Juyi3, LI Xuan3, CHU Chenglin3()   

  1. 1.Taizhou Branch of Jiangsu Special Equipment Safety Supervision and Inspection Institute,Taizhou 225300,China
    2.Jiangsu Provincial Storage Equipment Quality Supervision and Inspection Center,Taizhou 225300,China
    3.School of Materials Science and Engineering,Southeast University,Nanjing 211189,China
  • Received:2024-10-11 Online:2025-09-26 Published:2025-09-22
  • Contact: CHU Chenglin E-mail:490910632@qq.com;clchu@seu.edu.cn

摘要:

设计并搭建了模拟外部载荷工况的热氧老化实验装置用于研究聚乙烯燃气管道在外载作用下的老化行为。通过拉伸实验、扫描电子显微镜(SEM)、傅里叶红外光谱(FTIR)和差示扫描量热法(DSC)分析了高温外载作用下聚乙烯管材力学性能、微观组织以及热学性能变化。结果表明,随着高温老化时间的增加,聚乙烯管材的断裂伸长率和氧化诱导期下降,羰基指数和结晶度增加;外部载荷作用会加速聚乙烯的老化,在1 000 N外部载荷作用下,基于断裂伸长率、羰基指数和氧化诱导期所对应的老化速率分别是无外载作用时的1.82、1.17和1.3倍。

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

Abstract:

In this study, the thermal oxidative aging behavior of polyethylene gas pipelines was investigated under combined high⁃temperature and mechanical loading conditions. A specialized experimental apparatus was developed to simulate 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⁃transform 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) compared 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 maintenance strategies.

Key words: gas pipelines, high?density polyethylene, external load, thermal?oxidative aging, aging rate

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