干湿法聚丙烯腈原丝预氧化特性研究  

Study on preoxidation reaction property of PAN fibers by dry jet-wet spinning

作　　者：李常清[1] 史晓健[1] 马雷[1] 何州文 朱镇 徐樑华[1] 

机构地区：[1]北京化工大学碳纤维及功能高分子教育部重点实验室,北京100029 [2]国网智能电网研究院,北京102211

出　　处：《化工新型材料》2014年第10期109-111,共3页New Chemical Materials

基　　金：国家科技部973项目(2011CB605602);国家电网公司科技项目(SGRI-WD-71-13-005)

摘　　要：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） solutian was transferred into fiber through air layer into the coagulation bath. The structure of PAN precursors by wet and dry jet-wet spinning were characterized using X ray diffraction（XRD）, sound ve- locity meter and atomic force microscopy（AFM）. Preoxidation reaction properties of PAN fibers by wet and dry jet wet spinning were investigated using differential scanning calorimetry（DSC）, solid state NMR spectroscopy（NMR）and elemen- tal analyzer（EA）. The results showed that PAN precursor by dry jet wet spinning had the characteristics as smoother sur- face morphology and dense radial structure compared with PAN precursor by wet spinning. The compact difference did not affect the cyclization and dehydrogenation reaction of dry jet-wet PAN fiber in nitrogen, but greatly influenced its cyclization,dehydrogenation and oxidation reaction of dry jet-wet PAN fiber in oxygen medium. Compared with preoxidation temperature of wetspinning PAN fiber,dry jet-wet PAN fiber needed higher temperature chart,especially the final preoxidation temperature zone.

关 键 词：干湿法 PAN原丝 致密结构 预氧化 反应程度 

分 类 号：TQ342.3[化学工程—化纤工业]