The thermal stability of poly(aryl-ether–ether-ketone) as assessed by thermogravimetry†
The thermal stability of poly(aryl-ether–ether-ketone) as assessed by thermogravimetry†
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DOI：
10.1002/app.1989.070380214
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发表时间：
1989-07
影响因子：
3
通讯作者：
M. Day;J. Cooney;D. Wiles
中科院分区：
文献类型：
--
作者：
M. Day;J. Cooney;D. Wiles
对高温工程热塑性聚芳醚醚酮（PEEK）在氮气和空气中进行了动态和等温热重分析。动态数据进行了分析，使用基辛格峰最大值技术和一个isoconversional程序弗林开发。这些技术给出的表观全球活化能为223.5和235.7 kJ/mol，分别为PEEK在氮气中的降解，与等温实验确定的值219.7很好地吻合。PEEK在空气中的热稳定性远低于在氮气中的热稳定性，并且分解机理更复杂。从动态慢热速率数据和等温数据，在空气中的重量损失的全球表观活化能分别为116.9和159.5 kJ/mol。在空气中快速加热速率实验获得的数据被认为是误导性的，这表明在这些条件下，特别是在氧化过程可能发生的情况下，使用“商业”软件包进行寿命估计时应谨慎。
The high temperature engineering thermoplastic poly(aryl-ether–ether-ketone) (PEEK) has been subjected to dynamic and isothermal thermogravimetry in both nitrogen and air. The dynamic data have been analyzed using both the Kissinger peak maximum technique and an isoconversional procedure developed by Flynn. These techniques gave apparent global activation energies of 223.5 and 235.7 kJ/mol, respectively, for the degradation of PEEK in nitrogen, in good agreement with the value of 219.7 determined from the isothermal experiments. The thermal stability of PEEK in air is substantially less than in nitrogen, and the decomposition mechanism is more complex. The global apparent activation energies for the weight loss in air were found to be 116.9 and 159.5 kJ/mol from dynamic slow heat rate data and isothermal data, respectively. The data obtained from fast heating rate experiments in air were found to be misleading, suggesting caution in the use of “commercial” software packages for lifetime estimates under these conditions, especially where oxidative processes may be occurring.