Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 316, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2021.110941
Keywords
Mixed matrix membrane (MMM); Covalent triazine framework (CTF); Polysulfone (PSF); Matrimid (R); CO2/CH4 separation; Permeability models; Fractional free volume (FFV)
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Incorporating the filler material CTF-fluorene into polymer matrices can enhance CO2 and CH4 permeabilities in mixed matrix membranes (MMMs) without affecting the selectivity. The Maxwell model provides the best agreement with experimental results, and the contribution of filler porosity improves membrane permeability confirmed by calculations of the fractional free volume (FFV).
The porous and highly stable filler material CTF-fluorene was incorporated with 8, 16 and 24 wt% into the polymer matrices polysulfone (PSF) and Matrimid (R). The resulting mixed matrix membranes (MMMs) were investigated by binary mixture CO2/CH4 mixed gas measurements. With increasing filler content in the MMMs, CO2 and CH4 permeabilities were enhanced with no loss of CO2/CH4 selectivity. All membrane systems were compared to theoretical permeability models and the best agreement could be found applying the Maxwell model. Further, calculations of the fractional free volume (FFV) confirm the contribution of filler porosity to improve the membrane permeability.
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