Fire-resistant degradation mechanism of polyvinyl chloride cable sheaths exposed to different accelerated ageing conditions

IF 3.1 2区化学 Q2 CHEMISTRY, ANALYTICAL

Thermochimica Acta Pub Date : 2025-03-19 DOI:10.1016/j.tca.2025.179983

Hui Liu, Wenqiang Wang, Long Yan, Zhisheng Xu

引用次数: 0

Abstract

The ways, in which environmental conditions affect the fire safety of polyvinyl chloride (PVC) cables, are still a problem. The PVC sheaths were treated using three ways, including hygrothermal, salt spray and thermal ageing. The influence of various ageing conditions on the flame retardancy of PVC sheath was investigated by various analysis methods. The obtained results indicate that three environmental conditions have varying impacts on PVC sheaths, among which the hygrothermal environmental condition has the most unfavorable influence. Compared with the unageing PVC sheath, the cable sheath under hygrothermal environmental condition exhibits an increase by 9.7 % in total heat release, a reduction by 29.2 % in char residue, a reduction by 5.8 % in limiting oxygen index rating, and an increase by 66.3 % in maximum specific optical density. In addition, the correlation between the ageing factor and the fire-resistant degradation degree provides guidance for the maintenance of cables.

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不同加速老化条件下聚氯乙烯电缆护套耐火退化机理研究

环境条件如何影响聚氯乙烯（PVC）电缆的防火安全，仍然是一个问题。PVC护套采用三种处理方法，包括湿热、盐雾和热老化。采用多种分析方法，研究了不同老化条件对PVC护套阻燃性能的影响。研究结果表明，三种环境条件对PVC护套的影响是不同的，其中湿热环境条件对PVC护套的影响最大。与未老化的PVC护套相比，湿热环境下的电缆护套放热总量增加9.7%，炭渣减少29.2%，极限氧指数降低5.8%，最大比光密度提高66.3%。此外，老化系数与耐火退化程度之间的相关性为电缆的维护提供了指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thermochimica Acta 化学-分析化学

CiteScore

6.50

自引率

8.60%

发文量

210

审稿时长

40 days

期刊介绍： Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes