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采用“电纺-相分离-沥滤”方法制备了聚(偏氟乙烯-co-六氟丙烯)(PVDF-HFP)以及聚偏氟乙烯(PVDF)纳米多孔纳米纤维膜。首先,将PVDF-HFP或PVDF和致孔剂聚乙烯吡咯烷酮(PVP)混合电纺,得到共混物纳米纤维膜。然后,将纳米纤维膜在水中沥洗出共混物中的PVP,获得纳米多孔纳米纤维膜。用场发射扫描电子显微镜(FESEM)观察水洗前后纤维表面精细结构。结果表明,纳米多孔纳米纤维表面呈多孔结构,孔径数10 nm。PVP的分子量对水洗后纤维表面结构有明显影响。致孔剂含量不同获得的PVDF-HFP纳米多孔纤维膜力学性能相近。
Poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) and polyvinylidene fluoride (PVDF) nanofibrous nanofibrous membranes were prepared by electrospinning-phase separation-leaching method. First, PVDF-HFP or PVDF and porogen polyvinylpyrrolidone (PVP) were electrospun mixed to obtain a blend of nanofiber membranes. Then, the nanofiber membrane is leached out of the PVP in water to obtain a nanoporous nanofiber membrane. Fine structure of the fiber surface before and after washing was observed by field emission scanning electron microscopy (FESEM). The results show that the surface of the porous nano-porous porous structure, the number of pores 10 nm. The molecular weight of PVP has a significant effect on the surface structure of the fiber after washing. The mechanical properties of PVDF-HFP nanofibrous membranes obtained by different porogen contents are similar.