Pore size control technique in the spinning of polysulfone hollow fiber ultrafiltration membranes

✍ Scribed by Shoichi Doi; Katsuhiko Hamanaka

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 1021 KB
• Volume: 80
• Category: Article
• ISSN: 0011-9164
• DOI: 10.1016/0011-9164(91)85156-o

✦ Synopsis

Conditions for finger-like void formation in polysulfone (PS) ultrafiltration membranes were studied empirically. It was found that both the "mixability parameter" which was obtained in separate titration experiments and the viscosity of coagulants could be used to predict membrane morphology. It was also found that finger-like void layers appeared under the conditions which dope had concentrations quite apart from the phase separation area and which coagulant had both a low mixability parameter and low viscosity.

These factors proved to play a very important role in controlling the pore size of membranes . The results of this study were applied to obtaining pore size variations of PS hollow fiber membranes .