Poly(ethylene chlorotrifluoroethylene) membrane formation via thermally induced phase separation (TIPS)
Poly(ethylene chlorotrifluoroethylene) (ECTFE) is a 1:1 alternating copolymer of ethylene and chlorotrifluoroethylene that offers excellent resistance in chemically and thermally challenging environments. ECTFE membranes with a variety of microstructures have been fabricated via thermally induced...
| Үндсэн зохиолчид: | , , , |
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| Бусад зохиолчид: | |
| Формат: | Journal Article |
| Хэл сонгох: | English |
| Хэвлэсэн: |
2013
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| Нөхцлүүд: | |
| Онлайн хандалт: | https://hdl.handle.net/10356/100647 http://hdl.handle.net/10220/11010 |
| _version_ | 1826128682556588032 |
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| author | Roh, Il Juhn. Ramaswamy, Senthilkumar. Krantz, William B. Greenberg, Alan R. |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Roh, Il Juhn. Ramaswamy, Senthilkumar. Krantz, William B. Greenberg, Alan R. |
| author_sort | Roh, Il Juhn. |
| collection | NTU |
| description | Poly(ethylene chlorotrifluoroethylene) (ECTFE) is a 1:1 alternating copolymer of ethylene and chlorotrifluoroethylene
that offers excellent resistance in chemically and thermally challenging environments.
ECTFE membranes with a variety of microstructures have been fabricated via thermally induced phase
separation (TIPS) with dibutyl phthalate (DBP) as the diluent. A continuous flat sheet extrusion apparatus
with a double rotating drum was used that permitted controlling both the casting solution thickness and
axial tension on the nascent membrane. Initial compositions of ECTFE/DBP solutions in the liquid–liquid
region of the binary phase diagram were chosen, resulting in membranes with an interconnected pore
structure. The effects of several important process parameters were studied to determine their effect
on the structure and properties of the membrane. The parameters evaluated included the initial ECTFE
concentration, cooling rate, membrane thickness, co-extrusion of diluent, and stretching of the nascent
membrane. The resulting membranes were characterized using SEM, porometry, and permeation measurements.
For the range of process parameters studied, ECTFE membranes exhibited a decrease in surface
porosity with increasing initial polymer concentration and cooling rate. The effect of membrane thickness
on the permeation flux was not significant. Co-extrusion of diluent increased the surface porosity
and eliminated the dense skin that was otherwise present under rapid cooling conditions. Subsequent
stretching of the nascent membrane resulted in a more open structure and a significant increase in the
permeation flux. |
| first_indexed | 2024-10-01T07:28:56Z |
| format | Journal Article |
| id | ntu-10356/100647 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:28:56Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/1006472020-03-07T12:48:43Z Poly(ethylene chlorotrifluoroethylene) membrane formation via thermally induced phase separation (TIPS) Roh, Il Juhn. Ramaswamy, Senthilkumar. Krantz, William B. Greenberg, Alan R. School of Civil and Environmental Engineering Nanyang Environment and Water Research Institute Singapore Membrane Technology Centre DRNTU::Engineering::Civil engineering::Water resources Poly(ethylene chlorotrifluoroethylene) (ECTFE) is a 1:1 alternating copolymer of ethylene and chlorotrifluoroethylene that offers excellent resistance in chemically and thermally challenging environments. ECTFE membranes with a variety of microstructures have been fabricated via thermally induced phase separation (TIPS) with dibutyl phthalate (DBP) as the diluent. A continuous flat sheet extrusion apparatus with a double rotating drum was used that permitted controlling both the casting solution thickness and axial tension on the nascent membrane. Initial compositions of ECTFE/DBP solutions in the liquid–liquid region of the binary phase diagram were chosen, resulting in membranes with an interconnected pore structure. The effects of several important process parameters were studied to determine their effect on the structure and properties of the membrane. The parameters evaluated included the initial ECTFE concentration, cooling rate, membrane thickness, co-extrusion of diluent, and stretching of the nascent membrane. The resulting membranes were characterized using SEM, porometry, and permeation measurements. For the range of process parameters studied, ECTFE membranes exhibited a decrease in surface porosity with increasing initial polymer concentration and cooling rate. The effect of membrane thickness on the permeation flux was not significant. Co-extrusion of diluent increased the surface porosity and eliminated the dense skin that was otherwise present under rapid cooling conditions. Subsequent stretching of the nascent membrane resulted in a more open structure and a significant increase in the permeation flux. 2013-07-08T04:00:26Z 2019-12-06T20:25:53Z 2013-07-08T04:00:26Z 2019-12-06T20:25:53Z 2010 2010 Journal Article Roh, I. J., Ramaswamy, S., Krantz, W. B., & Greenberg, A. R. (2010). Poly(ethylene chlorotrifluoroethylene) membrane formation via thermally induced phase separation (TIPS). Journal of Membrane Science, 362(1-2), 211-220. 0376-7388 https://hdl.handle.net/10356/100647 http://hdl.handle.net/10220/11010 10.1016/j.memsci.2010.06.042 en Journal of membrane science © 2010 Elsevier B.V. |
| spellingShingle | DRNTU::Engineering::Civil engineering::Water resources Roh, Il Juhn. Ramaswamy, Senthilkumar. Krantz, William B. Greenberg, Alan R. Poly(ethylene chlorotrifluoroethylene) membrane formation via thermally induced phase separation (TIPS) |
| title | Poly(ethylene chlorotrifluoroethylene) membrane formation via thermally induced phase separation (TIPS) |
| title_full | Poly(ethylene chlorotrifluoroethylene) membrane formation via thermally induced phase separation (TIPS) |
| title_fullStr | Poly(ethylene chlorotrifluoroethylene) membrane formation via thermally induced phase separation (TIPS) |
| title_full_unstemmed | Poly(ethylene chlorotrifluoroethylene) membrane formation via thermally induced phase separation (TIPS) |
| title_short | Poly(ethylene chlorotrifluoroethylene) membrane formation via thermally induced phase separation (TIPS) |
| title_sort | poly ethylene chlorotrifluoroethylene membrane formation via thermally induced phase separation tips |
| topic | DRNTU::Engineering::Civil engineering::Water resources |
| url | https://hdl.handle.net/10356/100647 http://hdl.handle.net/10220/11010 |
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