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Cardo-type porous organic nanospheres: Tailoring interfacial compatibility in thermally rearranged mixed matrix membranes for improved hydrogen purification.
- Source :
-
Journal of Membrane Science . Oct2020, Vol. 612, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- Mixed-matrix membrane (MMM) is an effective way to overcome trade-off limitations of conventional polymeric membranes. However, the existence of defect voids at the polymer/filler interface often limits their performance improvement. Similar issues are also present in thermally rearranged polybenzoxazole (TR-PBO)-derived MMMs. To address this challenge, the selection of fillers is of great importance. Herein, a novel organic porous nanosphere (TC-cPSB), which is prepared by the polycondensation of 9,9-bis(4-aminophenyl) fluorene (BAFL) and terephthalaldehyde (TPAL) followed by thermal crosslinking, is chosen to engineer the polymer/filler interface. Benefiting from strong intermolecular interaction (π-π stacking and hydrogen bonding), the TC-cPSB nanosphere can well disperse in TR-PBO matrix with a defect-free interface. With an increase in TC-cPSB loading, well-designed MMMs exhibit a significant "anti-trade-off" phenomenon whereby gas permeability and selectivity increase simultaneously, following the trend predicted by the Maxwell model. Compared with TR-PBO membrane, the MMM containing 15 wt% of nanosphere shows an increase of 282% and 217.6% in H 2 /CO 2 selectivity and H 2 permeability, respectively, which is far beyond 2008 Robeson upper bound. Image 1 • TR-PBO/TC-cPSB MMMs were prepared for H 2 purification from the H 2 /CO 2 mixture. • The MMMs simultaneously increased gas permeability and selectivity due to good interfacial compatibility between TC-cPSB and TR-PBO. • TR-PBO/TC-cPSB-15 presented separation performance with 312.5 barrer of H 2 permeability and 5.35 of H 2 /CO 2 selectivity. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03767388
- Volume :
- 612
- Database :
- Academic Search Index
- Journal :
- Journal of Membrane Science
- Publication Type :
- Academic Journal
- Accession number :
- 145318060
- Full Text :
- https://doi.org/10.1016/j.memsci.2020.118414