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采用热重–差热分析(TG–DSC)对聚对苯二甲酰对苯二胺(PPTA)纤维、聚对亚苯基苯并双口恶唑(PBO)纤维和聚苯硫醚(PPS)纤维等耐高温有机纤维在氮气和空气2种不同气氛条件下的热分解行为进行研究,同时采用扫描电镜(SEM)观察热处理前后3种纤维的微观形貌,并对3种耐高温纤维的热稳定性进行对比。结果表明:在氮气和空气条件下,纤维表现出不一样的分解行为,在空气中分解比在氮气中剧烈得多;PBO纤维的热稳定性明显高于PPTA纤维和PPS纤维,PPS纤维热稳定性最差。
Poly (p-phenylene terephthalamide) (PPTA) fibers, polyparaphenylene benzobisoxazole (PBO) fibers and polyphenylene sulfide (PPS) fibers were characterized by TG-DSC. ) Fibers were investigated under two different atmospheres of nitrogen and air. The morphology of the three kinds of fibers before and after heat treatment was observed by scanning electron microscopy (SEM), and the thermal decomposition of three kinds of fibers with high temperature resistance Thermal stability is compared. The results showed that the fibers showed different decomposition behavior under nitrogen and air conditions, and decomposed much more in air than in nitrogen. The thermal stability of PBO fibers was significantly higher than that of PPTA fibers and PPS fibers. The thermal stability of PPS fibers The worst sex.