A ground breaking polymer blend for CO2/N2 separation
| Autor: | Rouzbeh Ramezani, Renzo Di Felice, Gomotsegang F. Molelekwa, Bart Van der Bruggen, Siavash Darvishmanesh, Saeed Mazinani |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Materials science Process Chemistry and Technology 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology Polyetherimide 01 natural sciences Miscibility 0104 chemical sciences chemistry.chemical_compound Membrane Differential scanning calorimetry chemistry Chemical engineering Chemical Engineering (miscellaneous) Polymer blend 0210 nano-technology Glass transition Selectivity Waste Management and Disposal |
| Popis: | The commercial polyetherimide sulfone polymer Extem was blended with polyethersulfone (PES) to achieve a new, highly selective membrane for CO2/N2 separation in order to allow for a breakthrough in carbon capture applications. The miscibility and molecular interaction between PES and Extem for blend compositions 80/20, 50/50 and 20/80 w/w were evaluated. Differential Scanning Calorimetry showed that of all the blend compositions, only the 20/80 blend is miscible as a single glass transition temperature was observed, lying between the glass transition temperatures of PES and Extem. FTIR spectra revealed shifts in functional group frequencies of the polymer blends, suggesting inter-molecular interactions between the polymer chains of Extem and PES. XRD patterns of the 20/80 blend showed a much lower characteristic peak intensity compared to other blend compositions, which indicates strong inter-molecular interactions. The density of the polymer blends was lower than that of the pure polymers, which is related to a decrease in fractional free volume. The separation performance of membranes synthesized with these blends was investigated for a gas mixture containing 15% vol. CO2. Blend membranes were limited by the tradeoff between permeability and selectivity, except for the 20/80 blend, which interstingly had a permeability and selectivity more than threefold that of other membranes, as the values hovered around the Robeson’s upper bound. The miscibility of Extem/PES therefore resulted in a new polymer material, which is a potential candidate for carbon capture applications. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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