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聚丙烯腈(PAN)溶液通过空气层进入凝固浴成纤制备干湿法原丝。采用X光衍射(XRD)、声速仪、原子力显微镜(AFM)表征干湿法原丝的结构,利用差示扫描量热仪(DSC)、固体核磁谱(NMR)、元素分析仪(EA)等研究了干湿法原丝的预氧化反应性质。结果表明:与湿法原丝相比,干湿法原丝表面光滑、结构致密。结构致密程度的差异,不影响干湿法原丝在氮气中预氧化过程的环化和脱氢反应,但极大影响了有氧介质中的环化、脱氢和氧化反应,使预氧化反应滞后。与湿法原丝的预氧温谱相比,干湿法原丝预氧温谱更高,特别要提高高温区的预氧温度。
Polyacrylonitrile (PAN) solution through the air layer into the coagulation bath fiber to prepare wet and dry precursor. The structures of the wet and dry precursor filaments were characterized by X-ray diffraction (XRD), acoustometer and atomic force microscope (AFM). The structure of the precursor was characterized by differential scanning calorimetry (DSC), solid nuclear magnetic resonance spectroscopy (NMR), elemental analyzer The preoxidation properties of the wet and dry precursor filaments were studied. The results show that, compared with the wet precursor, the wet and dry precursor filaments have a smooth surface and compact structure. The difference in the structure density does not affect the cyclization and dehydrogenation of the wet-dry precursor in nitrogen preoxidation, but greatly affects the cyclization, dehydrogenation and oxidation reactions in the aerobic medium. The pre-oxidation reaction Lag Compared with the pre-oxygen temperature spectrum of the wet precursor, the pre-oxygen temperature spectrum of the wet-dry precursor is higher, and in particular, the pre-oxygen temperature in the high temperature region should be increased.