Synthesis and enhanced CO2/CH4 selectivity of hyperbranched copolyimide membranes
| Autor: | Shuo Yan, Tao Yang, Biao Yuan, Hongchang Pang, Zan Chen, Cuijia Duan |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Polymers and Plastics Organic Chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Monomer Membrane chemistry Chemical engineering Materials Chemistry Gas separation 0210 nano-technology Selectivity Polyimide |
| Zdroj: | High Performance Polymers. 33:675-684 |
| ISSN: | 1361-6412 0954-0083 |
| DOI: | 10.1177/0954008320987290 |
| Popis: | A series of hyperbranched copolyimides (co-HBPIs), as the completely symmetrical tetraamine monomer successfully incorporated into the linear polyimide 6FDA-ODA, were synthesized under the chemical imidization after the gel formation was avoided, as to more effectively separate CO2/CH4. CO2/CH4 selectivity (74%) was observed to be improved significantly under 7‰ tetraamine contents at 2 bar and 35°C; thus, the acceptable CO2 permeability was maintained compared with the pure membrane, exceeding the 1991 upper bound. Moreover, the as-prepared membrane with 6FDA-ODA-7‰ was reported to exhibit higher CO2/CH4 selectivity (109.14) at 10 bar and 35°C. Accordingly, the hyperbranched copolyimides will be promising candidates as membrane materials for the further separation of CO2/CH4 gas pair. |
| Databáze: | OpenAIRE |
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