摘要
Poly （ m-phenylene isophthalamine） （PMIA） and Poly（ p-phenylene terphthalamine） （PPTA） are among the most important high-temperature resistant aramid fibers. The pyrolysis behaviors of these two fibers under inert gases were studied using pyrolysis-gas chromatography/mass spectrometry （Py-GC/MS） and thermogravimetric analysis coupled with mass spectrometry （ TGA-DTA/MS ）. The pyrolysis processes of PMIA and PPTA are distinguishing, and the stepwise pyrolysates reflect these differences. A mechanism system of pyrolysis is suggested, which involving hydrolysis and homolysis, At low pyrolysis temperatures, hydrolysis is a primary reaction, and it is very noticeable in the first-step pyrolysis region of PMIA. Elevating pyrolysis temperature, homolysis is enhanced and keep a large advantage in the high temperature range. On the other hand, at higher temperatures, carbonization happens and the homolysis and carbonization of PPTA are emphasized more than of PMIA.
Poly (m 苯撑 isophthalamine )(PMIA ) 并且(p 苯撑 terphthalamine )(PPTA ) Poly 在最重要的高温度的抵抗芳香族聚酰酩纤维之中。在惰性的气体下面的这二纤维的热分解行为用热分解气体层析 / 团 spectrometry (Py-GC/MS ) 被学习， thermogravimetric 分析结合了集体 spectrometry (TGA-DTA/MS ) 。PMIA 和 PPTA 的热分解过程正在区分，并且逐步的 pyrolysates 反映这些差别。热分解的一个机制系统被建议，它包含水解作用和 homolysis。在低热分解温度，水解作用是主要反应，并且它在 PMIA 的第一步的热分解区域是很显著的。提高热分解温度， homolysis 在高温度范围被提高并且作为一个大优点。在更高的温度，在另一方面， PPTA 的碳化 appens 和 homolysis 和碳化 PMIA 非常被强调。
