Abstract The aim of this work is to examine the pyrolysis and thermal properties of new and aged membranes. The results showed that the physical/chemical properties of membranes were changed after thermal aging. The onset decomposition temperature of the aged membrane was higher than that of the new one, whereas the maximum mass loss rate was reversed. The predicted thermogravimetric data by the ANN model, coincided well with the experimental data for both new and aged membranes. The average activation energy of the new membrane estimated by isoconversional methods was relatively higher than that of the aged one. A two-stage reaction modeling was employed to describe the degradation of new and aged membranes. The reaction mechanism of each stage was determined by the generalized master-plots method. The significant difference in reaction model between new and aged membranes was observed. Besides, the aged membrane released pyrolysis products later and less but faster than the new one. The burning results indicated that the aged membrane exhibited lower flammability and less heat release compared with the new one. The variation of pyrolysis and thermal behaviors between new and aged membranes was due to the changes of chemical component, molecular structure, and composition proportion.

中文翻译：

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热老化对商用质子交换膜分解行为和动力学机制的影响

摘要 这项工作的目的是检查新膜和老化膜的热解和热性能。结果表明，热老化后膜的物理/化学性质发生了变化。老化膜的起始分解温度高于新膜，而最大质量损失速率相反。ANN 模型预测的热重数据与新膜和老化膜的实验数据吻合良好。通过等转化方法估计的新膜的平均活化能相对高于旧膜。采用两阶段反应模型来描述新膜和老化膜的降解。各阶段的反应机理由广义主图法确定。观察到新膜和老化膜之间反应模型的显着差异。此外，老化的膜比新的膜释放热解产物更晚，但速度更快。燃烧结果表明，与新膜相比，老化膜表现出较低的可燃性和较少的放热。新旧膜之间热解和热行为的变化是由于化学成分、分子结构和组成比例的变化。