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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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Multicomponent Network Formation in Selective Layer of Composite Membrane for CO2 Separation.
Jelena Lillepärg1, Evgeni Sperling1, Marit Blanke1
1Helmholtz-Zentrum Geesthacht, Institute of Polymer Research, Max-Planck-Str. 1, 21502 Geesthacht, Germany.
Membranes
|March 6, 2021
Summary
Chemical crosslinking of PolyActive™ additives created networks in thin-film composite membranes. This modification doubled CO2 permeance while maintaining CO2/N2 selectivity, enhancing membrane performance for gas separation.
Area of Science:
- Materials Science
- Chemical Engineering
- Membrane Technology
Background:
- PolyActive™ is a promising material for CO2/N2 separation in thin-film composite membranes (TFCM).
- Previous research focused on modifying PolyActive™ with low-molecular-weight additives.
Purpose of the Study:
- To investigate the effect of chemical crosslinking of reactive end-group additives within PolyActive™ TFCM.
- To understand how embedded networks influence the properties of the polymer matrix and membrane performance.
Main Methods:
- Chemical crosslinking of additives within the selective layer of TFCM.
- Characterization using Fourier transform infrared spectroscopy (FTIR), gas transport measurements, differential scanning calorimetry (DSC), and atomic force microscopy (AFM).
Main Results:
- The crosslinking process formed networks within the polymer matrix.
- A twofold increase in CO2 permeance was observed.
- Insignificant losses in CO2/N2 selectivity were recorded.
Conclusions:
- Chemical crosslinking of additives is an effective strategy to enhance CO2 permeance in PolyActive™ TFCM.
- The embedded network structure improves gas transport properties without compromising separation performance.
- This approach offers a promising route for developing advanced membranes for CO2 capture.
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