为考察聚酰亚胺阻燃织物的耐热稳定性及热解气体成分,利用热重红外联用技术对聚酰亚胺织物的热解特性进行研究,通过热重法对样品进行定量分析,通过傅里叶变换红外光谱对织物热解逸出气体进行定性分析,同时对比了聚酰亚胺织物、阻燃棉织物、阻燃棉和芳纶ⅢA织物的热解性能。结果表明:在热重实验中,聚酰亚胺阻燃织物在550℃左右才开始热解,热解温度远高于阻燃棉和芳纶ⅢA织物,其最大热解速率稍低于芳纶ⅢA织物。通过观察傅里叶变换红外光谱发现,聚酰亚胺阻燃织物热解后逸出气体成分相对最少且基本为CO₂和CO气体,芳纶ⅢA织物热解后逸出气体成分较为复杂,阻燃棉织物热解后伴有有毒气体逸出,聚酰亚胺阻燃织物可作为消防防护服外层织物使用。

In order to investigate the heat stability and pyrolysis gas composition of polyimide flame retardant fabrics,the pyrolysis characteristics of polyimide fabrics were studied by TG-FTIR spectroscopy,the samples were quantitatively analyzed by thermogravimetry,the qualitative analysis was carried out by infrared analysis of the evolved gas.At the same time,the pyrolysis performance of polyimide fabric,flame retardant cotton fabric,and aramid ⅢA fabric were compared.The results shown in the thermogravimetric experiment,the polyimide fabrics started to crack at around 550℃,it was much higher than the flame retardant cotton and aramid ⅢA fabrics,and it's maximum pyrolysis rate was slightly lower than that of the aramid ⅢA fabric.In the infrared spectroscopy experiment,it was found that the gas composition of the polyimide fabric after pyrolysis was relatively minimal and the composition was basically CO₂ and CO gas.The gas composition of the aramid ⅢA fabric was more complicated,and the flame retardant cotton fabric was accompanied by toxic gas after pyrolysis.The polyimide retardant fabric can be used as an outer fabric of fire protection clothing.