PVDF中空纤维膜改性研究(1)交联PVP制备亲水化PVDF中空纤维膜  

Study on the modification of PVDF membrane (1) Preparation of hydrophilic PVDF hollow fiber membrane with PVP via cross-linking reaction

作　　者：毕秋艳[1] 田野[1] 李倩[1] 王晓琳[1] 

机构地区：[1]清华大学化学工程系,北京100084

出　　处：《膜科学与技术》2012年第6期22-27,共6页Membrane Science and Technology

基　　金：国家重点基础研究发展计划项目(973计划)(2009CB623401);国家高技术研究发展计划资助项目(863计划)(2009AA062901;2012AA03A604);北京市自然科学基金重大项目(2100001)

摘　　要：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45s内即可降至0°,膜的纯水通量为600L/(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.In this paper, hydrophilic microporous PVDF membranes were prepared via cross- linking between PVDF and PVP, as well as the self- cross-linking of PVP. Some influence factors on modification, such as PVP concentration and reaction time were investigated. The modified PVDF membranes were characterized by using FT-IR, NMR, contact angle measurements and mierofiltration experiments. The modified membranes exhibited a high hydrophilicity with a rapid decrease of dynamic contact angle within 45 seconds and high water flux of 600 L/（m2· h） at 0. 1 MPa. The cross-linked PVP was immobilized on and in the microporous PVDF membranes firmly which showed an excellent stability and anti-fouling performance. The PVDF-cl-PVP membranes＇ relative flux recovery increased by 16%.

关 键 词：聚偏氟乙烯 聚乙烯吡咯烷酮 交联反应 亲水化改性 

分 类 号：TQ325.4[化学工程—合成树脂塑料工业] TB383.2[一般工业技术—材料科学与工程]