Development of asymmetric BTDA-TDI/MDI (P84) copolyimide flat sheet and hollow fiber membranes for ultrafiltration : morphology transition and membrane performance
In this paper, the effects of γ-butyrolactone (GBL) weight ratio (wGBL) and membrane thickness on the formation of asymmetric flat sheet membranes prepared with P84 (BTDA-TDI/MDI co-polyimide)/N-methyl-2-pyrrolidone (NMP)/GBL casting solutions are investigated. With the increase of membrane thicknes...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2013
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| Online Access: | https://hdl.handle.net/10356/98627 http://hdl.handle.net/10220/10867 |
| _version_ | 1826123817560309760 |
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| author | Ren, Jizhong. Li, Zhansheng. |
| author2 | Institute of Environmental Science and Engineering |
| author_facet | Institute of Environmental Science and Engineering Ren, Jizhong. Li, Zhansheng. |
| author_sort | Ren, Jizhong. |
| collection | NTU |
| description | In this paper, the effects of γ-butyrolactone (GBL) weight ratio (wGBL) and membrane thickness on the formation of asymmetric flat sheet membranes prepared with P84 (BTDA-TDI/MDI co-polyimide)/N-methyl-2-pyrrolidone (NMP)/GBL casting solutions are investigated. With the increase of membrane thickness, the transition of membrane morphology from sponge-like to finger-like structure occurs at critical structure-transition thickness Lc. Lc and the general sponge-like structure thickness (Lgs) increase with wGBL. For 20 wt.% P84/NMP/GBL casting solution, the membrane morphology changes from finger-like to sponge-like structure at the critical weight ratio of GBL (w⁎ = 0.69). The membrane morphology and performance of hollow fibers spun with various wGBL are observed. Compared with the hollow fiber membranes made of 18 wt.% P84/NMP/GBL dope solution with wGBL = 0.75, the hollow fiber membranes spun with wGBL = 0.25 present a higher permeation flux and a larger MWCO. As wGBL increases from 0.25 to 0.75, the membrane morphology transfers from finger-like to sponge-like structure. An increase in shear rate shifts the rejection curves towards left, and lowers the MWCO of hollow fiber membranes. For hollow fiber membranes spun with wGBL = 0.75, a relatively high permeation flux and a large MWCO are obtained by the wet spinning process. |
| first_indexed | 2024-10-01T06:10:32Z |
| format | Journal Article |
| id | ntu-10356/98627 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:10:32Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/986272020-03-07T12:48:42Z Development of asymmetric BTDA-TDI/MDI (P84) copolyimide flat sheet and hollow fiber membranes for ultrafiltration : morphology transition and membrane performance Ren, Jizhong. Li, Zhansheng. Institute of Environmental Science and Engineering In this paper, the effects of γ-butyrolactone (GBL) weight ratio (wGBL) and membrane thickness on the formation of asymmetric flat sheet membranes prepared with P84 (BTDA-TDI/MDI co-polyimide)/N-methyl-2-pyrrolidone (NMP)/GBL casting solutions are investigated. With the increase of membrane thickness, the transition of membrane morphology from sponge-like to finger-like structure occurs at critical structure-transition thickness Lc. Lc and the general sponge-like structure thickness (Lgs) increase with wGBL. For 20 wt.% P84/NMP/GBL casting solution, the membrane morphology changes from finger-like to sponge-like structure at the critical weight ratio of GBL (w⁎ = 0.69). The membrane morphology and performance of hollow fibers spun with various wGBL are observed. Compared with the hollow fiber membranes made of 18 wt.% P84/NMP/GBL dope solution with wGBL = 0.75, the hollow fiber membranes spun with wGBL = 0.25 present a higher permeation flux and a larger MWCO. As wGBL increases from 0.25 to 0.75, the membrane morphology transfers from finger-like to sponge-like structure. An increase in shear rate shifts the rejection curves towards left, and lowers the MWCO of hollow fiber membranes. For hollow fiber membranes spun with wGBL = 0.75, a relatively high permeation flux and a large MWCO are obtained by the wet spinning process. 2013-07-01T07:11:24Z 2019-12-06T19:57:54Z 2013-07-01T07:11:24Z 2019-12-06T19:57:54Z 2011 2011 Journal Article Ren, J., & Li, Z. (2012). Development of asymmetric BTDA-TDI/MDI (P84) copolyimide flat sheet and hollow fiber membranes for ultrafiltration: Morphology transition and membrane performance. Desalination, 285, 336-344. 0011-9164 https://hdl.handle.net/10356/98627 http://hdl.handle.net/10220/10867 10.1016/j.desal.2011.10.024 en Desalination © 2011 Elsevier B.V. |
| spellingShingle | Ren, Jizhong. Li, Zhansheng. Development of asymmetric BTDA-TDI/MDI (P84) copolyimide flat sheet and hollow fiber membranes for ultrafiltration : morphology transition and membrane performance |
| title | Development of asymmetric BTDA-TDI/MDI (P84) copolyimide flat sheet and hollow fiber membranes for ultrafiltration : morphology transition and membrane performance |
| title_full | Development of asymmetric BTDA-TDI/MDI (P84) copolyimide flat sheet and hollow fiber membranes for ultrafiltration : morphology transition and membrane performance |
| title_fullStr | Development of asymmetric BTDA-TDI/MDI (P84) copolyimide flat sheet and hollow fiber membranes for ultrafiltration : morphology transition and membrane performance |
| title_full_unstemmed | Development of asymmetric BTDA-TDI/MDI (P84) copolyimide flat sheet and hollow fiber membranes for ultrafiltration : morphology transition and membrane performance |
| title_short | Development of asymmetric BTDA-TDI/MDI (P84) copolyimide flat sheet and hollow fiber membranes for ultrafiltration : morphology transition and membrane performance |
| title_sort | development of asymmetric btda tdi mdi p84 copolyimide flat sheet and hollow fiber membranes for ultrafiltration morphology transition and membrane performance |
| url | https://hdl.handle.net/10356/98627 http://hdl.handle.net/10220/10867 |
| work_keys_str_mv | AT renjizhong developmentofasymmetricbtdatdimdip84copolyimideflatsheetandhollowfibermembranesforultrafiltrationmorphologytransitionandmembraneperformance AT lizhansheng developmentofasymmetricbtdatdimdip84copolyimideflatsheetandhollowfibermembranesforultrafiltrationmorphologytransitionandmembraneperformance |