Performance control of asymmetric poly(phthalazinone ether sulfone ketone) ultrafiltration membrane using gelation |
| |
Authors: | Peiyong Qin Binbing Han Cuixian Chen Jiding Li Benhui Sun |
| |
Affiliation: | (1) College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, P. R. China;(2) Department of Chemical Engineering, Tsinghua University, Beijing, 100084, P. R. China;(3) Department of Chemical Engineering, Texas Tech University, Lubbock, TX 79409, USA |
| |
Abstract: | We studied the influence of the gelation conditions on the formation kinetics of the polyphthalazine ether sulfone ketone
(PPESK) membrane via wet phase inversion process experimentally and theoretically. Membrane formation and its morphology were
first observed with an online optical microscope - CCD camera system. The resulting membranes prepared under various gelation
conditions were then characterized by the gelation parameter, optical microscope, and SEM. Lastly, the relationship between
the final membrane structure/permeation properties and the gelation parameter was discussed extensively. The results showed
that both the gelation rate and the membrane flux increased dramatically as the gelation temperature increased. Moreover,
the membrane structures became loose, and the porosity of membrane increased. Different non-solvent could change the solubility
parameter between the polymer and the non-solvent, and thus the gelation rate greatly. With the increasing number of carbons
in non-solvent, the gelation rate became slow, and the membrane gradually changed from a finger structure into a sponge structure.
Adding NMP into the non-solvent changed the difference in the chemical potential and the solubility parameter between the
polymer solution and the non-solvent, which in turn changed the gelation rate of polymer solution greatly. With the increasing
concentration of NMP in non-solvent, the gelation rate became very slow and sponge structures formed with the non-solvent
system of 80% NMP. A novel conclusion could be made that we could control the flux and reject of membrane just by changing
the mean diffusion coefficient of skin, D, and the diffusion coefficient of skin, D1, in the process of membrane formation.
This work was presented at 13
th
YABEC symposium held at Seoul, Korea, October 20–22, 2007. |
| |
Keywords: | PPESK Gelation Kinetics Gelation Temperature Non-solvent Phase Inversion |
本文献已被 SpringerLink 等数据库收录! |
|