交联聚酰亚胺耐溶剂超滤膜的制备及性能研究  

Preparation and characterization of cross-linked polyimide solvent resistant ultrafiltration membrane

作　　者：李树轩 黄良伟 苏保卫[1] 高学理[1] LI Shuxuan;HUANG Liangwei;SU Baowei;GAO Xueli(Key Laboatory of Marine Chemistry Theory and Technology,Ministry of Education,College of Chemistry&Chemical Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学化学化工学院,海洋化学理论与工程技术教育部重点实验室,青岛266100

出　　处：《膜科学与技术》2018年第5期47-54,共8页Membrane Science and Technology

基　　金：国家自然科学基金项目(21476218)。

摘　　要：以商品聚酰亚胺(PI)为原料,采用相转化法和化学交联制备了交联聚酰亚胺耐溶剂超滤(SRUF)膜,分别考察了铸膜液中的PI浓度、空气蒸发时间、刮膜厚度等因素对SRUF膜分离性能的影响,分析了各个因素对膜微观结构的影响,表征了SRUF膜在交联前后化学结构的变化,并考察了膜的耐溶剂性能.结果表明,最优的制膜条件为PI质量分数20%,蒸发时间20s,刮膜厚度130μm,乙二胺交联时间5h,此时PI超滤膜的纯水通量可达790.5L/(m2·h),对牛血清蛋白(BSA)的截留率为84.6%.所制备的SRUF膜在DMF中浸泡60天后,截留率仅下降2%,在DMF、NMP、DMSO、THF中浸泡3个月后,膜面没有明显变化,说明该膜具有优异的耐有机溶剂性能.A kind of cross-linked polyimide(PI)membrane was prepared from commercial PI polymer(Lenzing P84)using phase inversion and chemical cross-linking for solvent resistant ultrafiltration(SRUF).The effects of PI polymer concentration,solvent evaporation time and membrane thickness on the separation performance of the SRUF membranes,and the influence of these factors on the microstructure of the SRUF membranes were analyzed.The changes in the chemical structure of the SRUF membranes before and after cross-linking were characterized,and the solvent resistance of the membranes was investigated.The results showed that the optimal preparation conditions were the PI polymer concentration of 20.0%(mass fraction),solvent evaporation time of 20 s,casting layer thickness of 130μm and crosslinking time of 5 h.Under the optimal preparation conditions,the pure water flux of the PI SRUF membrane can reach 790.5 L/(m 2·h),while the rejection of BSA can reach 84.6%.The rejection of BSA only decreased by 2%after the SRUF membranes being soaked in DMF at room temperature for 60 days.There was no obvious change on the membrane surface after being immersed in DMF,NMP,DMSO,and THF,respectively,for three months,indicating that the SRUF membrane prepared has excellent organic solvent resistance.

关 键 词：聚酰亚胺 相转化 耐溶剂超滤膜 交联 

分 类 号：TQ028.8[化学工程]