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Preparation and Characterization of Cross-linked Polyimide Solvent Resistant Ultrafiltration Membrane

Authors： Shuxuan Li, Liangwei Huang, Baowei Su, Xueli Gao

Units： (College of Chemistry & Chemical Engineering, Ocean University of China, Qingdao 266100, Shandong, China)

KeyWords： Polyimide; Phase Inversion; Solvent Resistant Ultrafiltration; Cross-linking

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2018,38(5):47-54

Abstract：

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 effect 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 wt%, solvent evaporation time of 20 s, casting layer thickness of 220 μm 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/(m2·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 immersing in DMF, NMP, DMSO, and THF, respectively, for three months, indicating that the SRUF membrane we prepared has excellent organic solvent resistance.

Funds：

国家自然科学基金项目（No.21476218）

AuthorIntro：

李树轩（1990-），男，山东邹城，硕士研究生，研究方向：膜分离技术，E-mail: lsxouc@163.com *通讯联系人，Tel/Fax.: +86-532-66786371；E-mail: subaowei@ouc.edu.cn

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