Comparing amine- and ammonium functionalized silsesquioxanes for large scale synthesis of hybrid polyimide high-temperature gas separation membranes
| Autor: | Farzaneh Radmanesh, Henk M. van Veen, Mark A. Hempenius, Nieck E. Benes, Luca Ansaloni, Eric Louradour, Thijs Peters, Monika Pilz, Dag Høvik |
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| Přispěvatelé: | MESA+ Institute, Films in Fluids, Sustainable Polymer Chemistry, Inorganic Membranes |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
UT-Hybrid-D Nanoteknologi: 630 [VDP] Filtration and Separation 02 engineering and technology 010402 general chemistry 01 natural sciences Biochemistry Interfacial polymerization Molecule General Materials Science Thermal stability Gas separation Physical and Theoretical Chemistry Nanotechnology: 630 [VDP] POSS Membranes Membraner 021001 nanoscience & nanotechnology 0104 chemical sciences Membranfiltrering Membrane Chemical engineering Amine gas treating 0210 nano-technology Selectivity Membrane filtration Polyimide |
| Zdroj: | Journal of Membrane Science Journal of membrane science, 637:119524. Elsevier |
| ISSN: | 0376-7388 |
| DOI: | 10.1016/j.memsci.2021.119524 |
| Popis: | PolyPOSS-imide membranes are promising for separating H2 from larger molecules (CO2, N2, CH4) at temperatures up to 300 °C. Their fabrication involves two steps: interfacial polymerization of POSS and 6FDA, followed by thermal imidization. This work provides a systematic study of the effects of cations on membrane properties and performance. For this, two distinct POSS molecules were used: functionalized with -NH3+Cl− or, so far unexplored, -NH2. The ammonium groups are partially deprotonated by using three different bases, LiOH, NaOH, and KOH. We demonstrate that the introduced cations affect the film thickness but not the molecular composition of the polyamic acid. All polyamic acids can be imidized, but the cations reduce the imidization kinetics as well as the loss of organic crosslinkers. For flat disc membranes, at 200 °C, the absence of cations results in comparable permeability combined with higher selectivity for H2/N2. This, and the possibility to discard adding a base, motivated a scale-up study of the new POSS. For tubular membranes, much higher ideal and mixed gas selectivities are found than for membranes where NaOH was added. Results indicate that the new route allows more reproducible production of defect free membranes and has potential for larger-scale polyPOSSimide fabrication. |
| Databáze: | OpenAIRE |
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