Abstract
In order to clarify the relationship between the porosity of membrane and the kinetics parameter of membrane formation ( D a) in polysulfone (PSF) ultrafiltration membrane, phase-inversion process was used in PSF membrane preparation from PSF casting solution with poly(ethylene glycol) (PEG) or poly(vinyl pyrrolidone) (PVP) introduction. A new method used to calculate D a was founded and an equation of D a = d 2/ t was established on the basis of the relationship between wet membrane thickness and coagulation time. It was found that there was substantial relationship between D a and porosity in PSF ultrafiltration membrane, and that the linear relationship between D a and porosity in PSF ultrafiltration membrane could be described as P(%) = a + bD a.
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