骆强, 曲芳, 姚志鹏, 赵旋, 王潇, 刘明谕, 窦双. 典型航空电缆的热解动力学研究[J]. 华南师范大学学报(自然科学版), 2021, 53(5): 30-36. doi: 10.6054/j.jscnun.2021072
引用本文: 骆强, 曲芳, 姚志鹏, 赵旋, 王潇, 刘明谕, 窦双. 典型航空电缆的热解动力学研究[J]. 华南师范大学学报(自然科学版), 2021, 53(5): 30-36. doi: 10.6054/j.jscnun.2021072
LUO Qiang, QU Fang, YAO Zhipeng, ZHAO Xuan, WANG Xiao, LIU Mingyu, DOU Shuang. Research on Pyrolysis Kinetics of Typical Aviation Cable[J]. Journal of South China Normal University (Natural Science Edition), 2021, 53(5): 30-36. doi: 10.6054/j.jscnun.2021072
Citation: LUO Qiang, QU Fang, YAO Zhipeng, ZHAO Xuan, WANG Xiao, LIU Mingyu, DOU Shuang. Research on Pyrolysis Kinetics of Typical Aviation Cable[J]. Journal of South China Normal University (Natural Science Edition), 2021, 53(5): 30-36. doi: 10.6054/j.jscnun.2021072

典型航空电缆的热解动力学研究

Research on Pyrolysis Kinetics of Typical Aviation Cable

  • 摘要: 含氟聚合物绝缘电缆为航空线缆的主要体系. 选取以聚四氟乙烯(PTFE)、可熔性聚四氟乙烯(PFA)、聚全氟乙丙烯(FEP)3种含氟聚合物为护套的航空电缆作为研究对象,采用热重-差热同步分析仪研究氮气气氛中不同升温速率下3种材料的热分解特性,结果表明:PTFE的热分解过程为1个阶段,而PFA和FEP的热分解过程均为2个阶段,且PTFE的初始分解温度和10%质量损失率温度均高于PFA和FEP的相应值,因此,PTFE比PFA和FEP更不容易发生热解. 分别使用Ozawa法、Kissinger-Akahira-Sunose(KAS)法、Starink法和Friedman法进行非等温的热解动力学分析,针对同一材料,Ozawa法、KAS法以及Starink法计算出的表观活化能基本相同,而Friedman法计算出的表观活化能略高于上述3种方法所得结果. 对比可知PTFE的初期表观活化能和平均表观活化能均大于PFA和FEP的相应值,因此PTFE在整个热解反应过程中的热稳定性相对最优.

     

    Abstract: The fluoropolymer insulated cable is the main system of aviation cable. Aviation cables with polytetrafluoroethylene (PTFE), fusible polytetrafluoroethylene (PFA) and perfluoroethylene propylene (FEP) as sheaths were selected for the study of their thermal decomposition characteristics with the thermogravimetric analyzer under different heating rates in nitrogen atmosphere. The results showed that the pyrolysis process of PTFE was only one stage, while that of PFA and FEP was differentiated into two stages respectively. At the same time, the initial decomposition temperature and 10% weight loss temperature of PTFE were both higher than those of PFA and FEP. Therefore, PTFE is less prone to thermal decomposition than PFA and FEP. The analysis of non-isothermal pyrolysis kinetics was carried out with the aid of four methods, including Ozawa, Kissinger-Akahira-Sunose (KAS), Starink and Friedman. The values of apparent activation energy calculated using the Ozawa, KAS and Starink methods were basically identical for the same material. However, the apparent activation energy values estimated with the Friedman method were slightly higher than those obtained with the other three methods. It was found that the initial apparent activation energy and average apparent activation energy of PTFE were both higher than the corresponding values of PFA and FEP, so the thermal stability of PTFE was the best in the whole pyrolysis process.

     

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