2015•Membrane science and technology/Membrane science and technology seriesRequires access
The compatibility of PSf and SPES blends and its effects on the structure and performance of blend membrane
Zhao Baoba
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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 1 397L/(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.