【作者】 于美杰； 王启芬； 胡秀颖； 朱波； 王成国；

【Author】 YU Meijie,WANG Qifen,HU Xiuying,ZHU Bo,WANG Chengguo (Shandong University,Jinan,250061,Shandong China)

【机构】 山东大学；

【摘要】 采用扫描电镜(SEM)和原子力显微镜(AFM)研究了从聚丙烯腈纤维到碳纤维整个过程中各阶段纤维中的原纤结构形貌,进一步完善了原纤结构模型。结果表明,原丝、预氧丝和碳纤维中都存在原纤结构,原纤由尺度更小的微原纤构成,而微原纤内部存在片层结构。原丝和预氧丝中各级结构的尺度相差不大,其中原纤直径约几百纳米,微原纤直径为50～200nm,片层厚度约20～40nm。随碳化温度提高,原纤和微原纤尺度逐渐减小,1350℃碳纤维中的微原纤直径约50～60nm。超声溶剂蚀刻法只能从原丝和预氧化初期的纤维中成功分离出原纤,而碳纤维的微原纤结构及内部片层结构能够在AFM下直接观察到。更多还原

【Abstract】 Scanning electron microscopy and atomic force microscopy were used to study the fibril structure and morphologies from polyacrylonitrile fibers to carbon fibers during the whole production process.The fibril structure model was improved.The results show that fibril structure is present in all the fibers.Fibrils are consisted of microfibrils with smaller size,and inside microfibrils is the lamellar structure.The various level size of the precursor fibers and preoxidized fibers are similar,of which the diameter of fibrils is several hundred nanometers or so,of microfibril is 50～200nm,the thickness of lamelle is 20～40nm.With the rising of carbonization temperature,the size of fibril and microfibril gradually decreases.The diameter of microfibril in 1350℃ is 50-60nm.The fibrils can be successfully separated only from precursor fibers and preoxidized fibers at previous period by supersonic solvent etching method,while the microfibrils and lamelle in carbon fibers can be clearly observed by AFM.更多还原