利用聚乙烯吡咯烷酮(PVP)的自交联以及与聚偏氟乙烯(PVDF)的互交联,实现了PVDF微孔膜的亲水化改性.考察了溶液浓度、反应时间等因素对改性PVDF膜性能的影响,采用FT-IR、NMR、接触角和水通量等测试方法表征改性前后PVDF膜的性能.结果表明,自交联PVP的强吸水性使得改性后的PVDF膜(PVDF-cl-PVP膜)亲水性显著提高,与水的接触角45 s内即可降至0°,膜的纯水通量为600 L/(m2·h).PVDF与PVP的互交联以及PVP的自交联结构使得PVP牢牢固定于PVDF微孔膜外表面及膜内部孔通道表面,实现了PVDF微孔膜的永久亲水化.PVDF-cl-PVP膜经纯水反复清洗后仍能保持很高的亲水性.经PVP改性后,PVDF膜的通量恢复率提高了16％,表明PVDF-cl-PVP膜的抗污染性得到显著提高.
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