Polyphenylsulfone (PPSU) ultrafiltration membrane with different structures was prepared by nonsolvent-induced phase separation. The effects of coagulation bath conditions (concentration and temperature) on membrane morphology

pure water flux

pore size

porosity

and contact angle were studied and discussed based on ternary-phase diagrams. Results indicated that water had stronger coagulant power than ethanol

and that the morphology of the membrane prepared from the polyphenylsulfone/1-methyl- 2-pyrrolidinone/H

2

O (PPSU/NMP/H

2

O) system had finger-like structures. Conversely

sponge-like structures were observed for the PPSU/NMP/(NMP-H

2

O) and PPSU/NMP/(70NMP-EtOH-H

2

O) systems. Ethanol also greatly influenced on membrane structures. According to the Scanning electronic microscopy (SEM) image

the composition (mass fraction) of casting solution is 16% PPSU-84% NMP and the coagulation bath consisting of 70% NMP-26% H

2

O-4% C

2

H

5

OH. Meanwhile

the PPSU ultrafiltration membrane with spong-like was prepared under 8 ℃ coagulation bath. The formation of sponge-like structure reduces the pure water flux of ppsu membrane from 488.39 L·m

-2

·h

-1

to 36.04 L·m

-2

·h

-1

. It also reduces the gas permeability

porosity

and pore size of the membrane. The addition of ethanol and NMP into the coagulation bath increases the roughness of the PPSU ultrafiltration membrane and reduces the hydrophilicity of the membrane.