Morphology transition of asymmetric flat sheet and thickness-gradient membranes by wet phase-inversion process
Ren, J; Zhou, J; Deng, M
| HERO ID | 3577381 |
|---|---|
| In Press | No |
| Year | 2010 |
| Title | Morphology transition of asymmetric flat sheet and thickness-gradient membranes by wet phase-inversion process |
| Authors | Ren, J; Zhou, J; Deng, M |
| Journal | Desalination |
| Volume | 253 |
| Issue | 1-3 |
| Page Numbers | 1-8 |
| Abstract | In this paper. asymmetric membranes are prepared with P84 (BTDA-TDI/MDI co-polyimide)/N-methyl-2-pyrrolidone (NMP)/-gamma-butyrolactone (GBL) and polyetherimide (PEI)/NMP/GBL. casting solutions by wet phase-inversion process And the transition of membrane morphology is investigated with different flat sheet and thickness-gradient membranes. For the thickness-gradient membranes, with the increase of membrane thickness, the membrane morphology changes from sponge-like to finger-like structure at the critical structure-transition thickness L(c). Meanwhile, the general sponge-like structure thickness L(gs) underneath the membrane surface is almost a constant. And the morphology of thickness-gradient membranes IS Illustrated with three different thickness regions. For the flat sheet membranes prepared with PEI/NMP/GBL casting Solutions. with the increase of GBL. weight ratio w(GBL), the transition of membrane morphology from finger-like to sponge-like structure occurs it the critical weight ratio of GBL (w* = 0.588) The presence of GBL increases the viscosity of the casting solutions and suppresses the tendency of macrovoid formation. For the thickness-gradient membranes prepared with PEI/NMI/GBL casting solutions, the presence of GBL retards the transition of membrane morphology The increase of w(GBL), results in the increase of L(c) and L(gs). When WGBL is greater than w*, the transition of membrane morphology is not investigated and a fully sponge-like structure is formed (C) 2009 Elsevier B V All rights reserved. |
| Doi | 10.1016/j.desal.2009.12.001 |
| Wosid | WOS:000275589400001 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Journal: ISSN: |
| Is Public | Yes |
| Keyword | Morphology transition; Flat sheet membrane; Thickness-gradient membrane; Critical structure-transition thickness |