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The compatibility of PSf and SPES blends and its effect on the structure and performance of blend membrane

Authors： ZHAO Baobao1, 2, LI Shiwen1, 3, FU Zhengang1, 3, QIAN Xiaoming2*, LI Jianxin1, 3*

Units： 1. State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Tianjin Polytechnic University, Tianjin 300387, China；2. School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China; 3. School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China

KeyWords： polysulfone (PSf); sulfonated polyethersulfone (SPES); compatibility; non-solvent induced phase separation (NIPS); ultrafiltration

ClassificationCode：TQ 028.8

year,volume(issue):pagination： 2015,35(5):6-12

Abstract：

The compatiblity of polysulfone (PSf) and sulfonated polyethersulfone (SPES) blend system with different mass ratios was predicted by mixing enthalpy calculation and characterized by differential scanning calorimetry (DSC). The PSF/SPES blend membranes were prepared by non-solvent induced phase separation (NIPS). The effects of blending compatiblity on the structure and performance of PSF/SPES blend membranes were investigated. The results showed that the PSf/SPES blend system with PSf/SPES mass ratio less than 90/10 was a partial compatiblity and the compatiblity decreased with the increase of PSf/SPES mass ratio. Further, the PSF/SPES blend membranes with the mass ratio less than 90/10 obtained exhibited gradient sponge-like asymmetrical structure. The hydrophilcity, surface pore size, porosity and pure water flux of the obtained blend membrane increased with an increase in PSf/SPES mass ratio. When PSf/SPES mass ratio was 92/8, the pure water flux of blend membrane obtained was 1397 L/ (m2·h) and BSA rejection was higher than 85%. The PSf/SPES blend system with PSf/SPES mass ratio more than 90/10 was immiscible. The blend membranes obtained appeared finger-like pores and the rejection for BSA observably decreased.

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