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Effects of additives on the  properties of polyimide ultrafiltration membranes 
Authors： SONG Yun, ZHAO Wei, ZHANG  Bing
Units： School of Petrochemical Engineering, Shenyang University of Technology, Liaoyang 111003, China
KeyWords： polyimide; PI; ultrafiltration membrane; additive
ClassificationCode：TQ028.8
year,volume(issue):pagination： 2026, 46(4):128-137

Abstract：

Polyimide (PI) possesses a number of excellent properties including chemical stability, aging resistance, and mechanical properties useful for ultrafiltration membranes preparation with good performance. In this research, PI ultrafiltration membranes were prepared by the non-solvent induced phase separation method with N-methyl-2-pyrrolidone (NMP) as solvent, and the effects of the additive [polyethylene glycol 400 (PEG400), anhydrous LiCl, and polyvinyl-pyrrolidone (PVP) K30 on the morphology and properties of the membranes were investigated. Microstructure forming mechanism of the membranes was analyzed in terms of the thermodynamic stability and phase separation kinetics of the PI/NMP/additive/water system. The introduction of the PEG400 and PVP K30 led to the reduction of the thermodynamic stability of the casting solution/water system. The membrane exhibited a thinner skin layer and bubble-like pores appeared under the cellular pore support layer. While the introduction of the anhydrous LiCl improved the thermodynamic stability of the casting solution/water system and resulted in a thicker sponge-like-pore skin layer and a thinner finger-like-pores support layer. The increase of PEG400 content resulted in the increase of the pure water flux and decrease of the bovine serum albumin (BSA) rejection rate. The membrane owned a pure water flux of 130 L/(m2·h) that was 5.5 times of the PI ultrafiltration membrane prepared without additives (pristine membrane) at the PEG400 mass fraction of 6%, where the BSA rejection rate was 95%. The pure water flux of the PI ultrafiltration membrane initially increased and then decreased with the increase of the PVP K30 and anhydrous LiCl contents, while the BSA rejection rate first decreased and then increased. The maximum pure water fluxes were 118 L/(m2·h) and 107 L/(m2·h) respectively, being 4.9 and 4.4 times of the pristine membrane, where the BSA rejection rates were 95% and 97% respectively, when the PVP K30 and anhydrous LiCl mass fraction were 2%.

Funds：

 辽宁省“兴辽英才计划”项目(XLYC2404028)；辽宁省高校重点科研项目(LJ222510142001)

AuthorIntro：
宋耘（2001-），男，辽宁盘锦人，硕士研究生，主要研究方向为超滤膜技术.*通讯作者，赵薇，E-mail：zhaowei@sut.edu.cn；张兵，E-mail：zhangbing@sut.edu.cn

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