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通过溶液聚合得到胺化碳纳米管(Amid-CNT)/聚丙烯腈(PAN)复合溶液,采用湿法纺丝技术制备了Amid-CNT/PAN复合纤维。利用红外光谱、拉曼光谱、差示扫描量热仪、热失重仪和扫描电镜等方法分析Amid-CNT对PAN纤维结构的影响。结果表明:Amid-CNT与PAN大分子之间有很强的化学作用力;Amid-CNT在复合纤维中具有很高程度的取向,使PAN纤维中氰基的取向从1.61提高到了2.30;复合纤维在空气中的起始放热温度相对PAN纤维从212.30℃提前到206.01℃,反应放热量从3054 J/g降低到2346 J/g;复合纤维比PAN纤维的起始失重温度提前了3.7℃,在700℃时的剩余质量提高了13.5%;复合纤维的断面比PAN纤维具有更多的絮状结构。
Amid-CNT / PAN composite fibers were obtained by solution polymerization. Amid-CNT / PAN composite fibers were prepared by wet spinning. The effects of Amid-CNT on PAN fiber structure were analyzed by infrared spectroscopy, Raman spectroscopy, differential scanning calorimetry, thermogravimetry and scanning electron microscopy. The results showed that there was a strong chemical interaction between Amid-CNT and PAN macromolecules. Amid-CNTs had a high degree of orientation in the conjugate fibers and the orientation of cyano groups in PAN fibers increased from 1.61 to 2.30. The initial exothermic temperature in air decreased from 212.30 ℃ to 206.01 ℃ and the exothermic heat of reaction decreased from 3054 J / g to 2346 J / g. The initial weight loss temperature of composite fiber was 3.7 ℃ earlier than PAN fiber, The residual mass increased by 13.5% at 700 ℃. The cross section of the composite fiber had more floc structure than PAN fiber.