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采用电纺法制备超细纤维,利用相分离沥滤机理致孔,也称为电纺-相分离-沥滤法(Electrospinning-Phaseseparation-Leaching,EPL),制备纳米多孔超高比表面积超细纤维.将聚丙烯腈(PAN)和聚乙烯基吡咯烷酮(PVP)溶于共溶剂中进行电纺,获得共混物超细纤维,PAN与PVP发生相分离,利用PVP溶于水的特点沥滤洗出PVP而致孔.采用场发射扫描电子显微镜(FESEM)观察纤维表面和截面结构,并用比表面测定仪测量超细纤维的比表面积.结果显示,纤维比表面积随电纺溶液中PVP含量增加而增大,直径为2130nmPAN多孔纤维的比表面积达到了70m2/g以上,超细纤维的截面呈现多孔结构,孔尺寸约30nm.
The ultrafine fibers are prepared by electrospinning method, and the pores are formed by the phase separation leaching mechanism, also called Electrospinning-Phase Separation-Leaching (EPL), to prepare nano-porous ultra-high specific surface area ultrafine fibers The polyacrylonitrile (PAN) and polyvinylpyrrolidone (PVP) are dissolved in a co-solvent for electrospinning to obtain the ultrafine fibers of the blends, and the phase separation between PAN and PVP takes advantage of the characteristics of PVP dissolved in water, leaching and washing PVP was used to make pores.The surface and cross-sectional structure of fibers were observed by field emission scanning electron microscopy (FESEM), and the specific surface area of ultrafine fibers was measured by specific surface area analyzer.The results showed that the fiber surface area increased with PVP content in electrospinning solution , The specific surface area of 2130nm PAN porous fiber reaches over 70m2 / g, the cross section of the microfiber has a porous structure and the pore size is about 30nm.