含氟聚合物纳米多孔纳米纤维膜的制备

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.

Preparation of nano-porous nanofiber mats of fluoro polymers by electrospinning

Nano-porous nanofiber mats of poly(vinylidenefluoride-co-hexafluoropropylene)(PVDF-HFP) and poly(vinylidenefluoride)(PVDF) were prepared by the method of "electrospinning-phase separation-leaching"(EPL).The nanofiber mats of the composites of PVDF-HFP or PVDF and polyvinylpyrrolidone(PVP) used as porogen were prepared by co-electrospinning.After PVP in the nanofiber mats of the composites was leached out in water,nano-porous nanofibers of fluoro polymers were obtained.The structures of surface of the nano-porous nanofibers were observed in detail by field emission scanning electron microscope(FESEM).The images of FESEM showed many pores with the diameter of tens of nanometers in the fibers.The molecular weight of PVP plays an important role on the structure of surface of nano-porous fibers.The nano-porous fiber mats of PVDF-HFP have similar tensile strength and Young's modulus as the content of PVP of porogen changed.