Free-Standing, Polysilsesquioxane-Based Inorganic/Organic Hybrid Membranes for Gas Separations
- Free-Standing, Polysilsesquioxane-Based Inorganic/Organic Hybrid Membranes for Gas Separations
- 강우람; 알버트 이성수; 박성환; 박상희; 백경열; 이기봉; 이상협; 이정현; 황승상; 이종석
- Issue Date
- Journal of membrane science
- VOL 475, 384-394
- Polysilsesquioxanes (PSSQs) are composite materials consisting of inorganic framework and organic functional groups. Their inherent dual characteristics offer various applications including microelectronics, optics and biosciences. For the first time, free standing ladder-like PSSQ films were successfully prepared for gas separations, allowing practical applications in the membrane area. In order to fabricate a free-standing PSSQ film, a novel ladder-like poly(phenyl-co-glycidoxypropyl) silsesquioxanes with phenyl:glycidoxypropyl copolymer ratio of 6:4 (LPG64) were synthesized by a base-catalyzed sol-gel reaction. Moreover, the LPG64 films were thermally crosslinked with octa(aminophenyl)-T8-silsesquioxane (OAPS) with different concentrations of OAPS. Single gas (i.e. He, H2, CO2, O2, N2, and CH4) transport measurements were performed for the LPG64 as well as LPG64/OAPS composite membranes. The LPG64 membrane exhibited a relatively high CO2 permeability of 47.88 Barrer compared to other gases with CO2/N2 permselectivity of 30.5. The annealing effect on the transport results of the LPG64 membrane was negligible due to its rigid inorganic framework. Combination of our transport analysis and XRD characterization demonstrated that the addition of OAPS led to more dense chain packing, reducing permeability for all the gases tested in this work with increase in permselectivities. Especially, the LPG64/OAPS (80/20 wt/wt) membrane improved He/N2 and H2/N2 permselectivities by 98 and 80%, respectively, compared to those for neat LPG64 membranes.
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