| Autor: |
Menno Houben, Joey Kloos, Machiel van Essen, Kitty Nijmeijer, Zandrie Borneman |
| Přispěvatelé: |
Membrane Materials and Processes, EIRES Eng. for Sustainable Energy Systems, EIRES Chem. for Sustainable Energy Systems |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Journal of Membrane Science, 647:120292. Elsevier |
| ISSN: |
0376-7388 |
| Popis: |
The suppression of CO2-induced plasticization in polyimide membranes at supercritical conditions up to 120 bar is investigated. Three approaches (polymer blending, thermal treatments and chemical crosslinking) known from relatively low-pressure applications are applied and their effectiveness to suppress membrane plasticization at high CO2 pressures and under supercritical conditions is systematically identified. CO2 sorption measurements reveal that especially Henry sorption promotes plasticization and that the corresponding Henry sorption parameter (kD) correlates with the d-spacing and Tg of the membranes. A lower d-spacing and higher Tg results in a reduced kD parameter and thus a higher resistance to plasticization. A high interchain rigidity is required to suppress plasticization at the highly plasticizing liquid-like CO2 densities. Chemical and thermo-oxidative crosslinking results in the largest decrease in interchain mobility and therefore shows the highest resistance to plasticization, but also a significantly lower permeability. Thermally treating the membranes in N2 retains a high permeability, while still displaying significant plasticization resistance. Polymer blending does increase the plasticization resistance, but strongly reduces the permeability. All three methods manage to suppress plasticization at supercritical conditions, but crosslinking offers superior plasticization resistance. However, proper tailoring strategies are required to combine a high plasticization resistance with a high permeability. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect