Solidification Behavior of Polymer Solution during Membrane Preparation by Thermally Induced Phase Separation
The solidification behavior of poly(vinylidene fluoride) (PVDF) solution during membrane preparation by thermally induced phase separation (TIPS) was investigated. Apparatus newly developed in our laboratory was used to quantitatively measure membrane stiffness during phase separation. In this appar...
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| Format: | Article |
| Language: | English |
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MDPI AG
2014-02-01
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| Series: | Membranes |
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| Online Access: | http://www.mdpi.com/2077-0375/4/1/113 |
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| author | Toru Ishigami Yoko Nii Yoshikage Ohmukai Saeid Rajabzadeh Hideto Matsuyama |
| author_facet | Toru Ishigami Yoko Nii Yoshikage Ohmukai Saeid Rajabzadeh Hideto Matsuyama |
| author_sort | Toru Ishigami |
| collection | DOAJ |
| description | The solidification behavior of poly(vinylidene fluoride) (PVDF) solution during membrane preparation by thermally induced phase separation (TIPS) was investigated. Apparatus newly developed in our laboratory was used to quantitatively measure membrane stiffness during phase separation. In this apparatus, a cooling polymer solution, placed on a stage, is moved upwards and the surface of the polymer solution contacts a sphere attached to the tip of a needle. The displacement of a blade spring attached to the needle is then measured by a laser displacement sensor. Different phase separation modes, such as liquid-liquid (L-L) phase separation and solid-liquid (S-L) phase separation (polymer crystallization) were investigated. In the case of S-L phase separation, the stiffness of the solution surface began to increase significantly just before termination of crystallization. In contrast, L-L phase separation delayed solidification of the solution. This was because mutual contact of the spherulites was obstructed by droplets of polymer-lean phase formed during L-L phase separation. Thus, the solidification rate was slower for the L-L phase separation system than for the S-L phase separation system. |
| first_indexed | 2024-03-12T09:12:23Z |
| format | Article |
| id | doaj.art-f39084fafdbc49bf8ac741bfaf31a05b |
| institution | Directory Open Access Journal |
| issn | 2077-0375 |
| language | English |
| last_indexed | 2024-03-12T09:12:23Z |
| publishDate | 2014-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj.art-f39084fafdbc49bf8ac741bfaf31a05b2023-09-02T14:56:59ZengMDPI AGMembranes2077-03752014-02-014111312210.3390/membranes4010113membranes4010113Solidification Behavior of Polymer Solution during Membrane Preparation by Thermally Induced Phase SeparationToru Ishigami0Yoko Nii1Yoshikage Ohmukai2Saeid Rajabzadeh3Hideto Matsuyama4Center for Membrane and Film Technology, Department of Chemical Engineering, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, JapanCenter for Membrane and Film Technology, Department of Chemical Engineering, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, JapanCenter for Membrane and Film Technology, Department of Chemical Engineering, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, JapanCenter for Membrane and Film Technology, Department of Chemical Engineering, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, JapanCenter for Membrane and Film Technology, Department of Chemical Engineering, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, JapanThe solidification behavior of poly(vinylidene fluoride) (PVDF) solution during membrane preparation by thermally induced phase separation (TIPS) was investigated. Apparatus newly developed in our laboratory was used to quantitatively measure membrane stiffness during phase separation. In this apparatus, a cooling polymer solution, placed on a stage, is moved upwards and the surface of the polymer solution contacts a sphere attached to the tip of a needle. The displacement of a blade spring attached to the needle is then measured by a laser displacement sensor. Different phase separation modes, such as liquid-liquid (L-L) phase separation and solid-liquid (S-L) phase separation (polymer crystallization) were investigated. In the case of S-L phase separation, the stiffness of the solution surface began to increase significantly just before termination of crystallization. In contrast, L-L phase separation delayed solidification of the solution. This was because mutual contact of the spherulites was obstructed by droplets of polymer-lean phase formed during L-L phase separation. Thus, the solidification rate was slower for the L-L phase separation system than for the S-L phase separation system.http://www.mdpi.com/2077-0375/4/1/113solidification ratemembrane preparation processthermally induced phase separationpoly(vinylidene fluoride) |
| spellingShingle | Toru Ishigami Yoko Nii Yoshikage Ohmukai Saeid Rajabzadeh Hideto Matsuyama Solidification Behavior of Polymer Solution during Membrane Preparation by Thermally Induced Phase Separation Membranes solidification rate membrane preparation process thermally induced phase separation poly(vinylidene fluoride) |
| title | Solidification Behavior of Polymer Solution during Membrane Preparation by Thermally Induced Phase Separation |
| title_full | Solidification Behavior of Polymer Solution during Membrane Preparation by Thermally Induced Phase Separation |
| title_fullStr | Solidification Behavior of Polymer Solution during Membrane Preparation by Thermally Induced Phase Separation |
| title_full_unstemmed | Solidification Behavior of Polymer Solution during Membrane Preparation by Thermally Induced Phase Separation |
| title_short | Solidification Behavior of Polymer Solution during Membrane Preparation by Thermally Induced Phase Separation |
| title_sort | solidification behavior of polymer solution during membrane preparation by thermally induced phase separation |
| topic | solidification rate membrane preparation process thermally induced phase separation poly(vinylidene fluoride) |
| url | http://www.mdpi.com/2077-0375/4/1/113 |
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