Extra-high-performance low-level filler-loaded mixed-matrix membranes
(MMMs) were fabricated by embedding a flexible cyclooligomer,
calix[4]arene (CA), as a macrocyclic porous filler in two blends of
a commercial polyether block amide polymer, Pebax MH 1657. Two kinds
of liquid phases, PEG550 (PEG) and [OMIM][PF6] (IL), were
separately introduced into the Pebax MH 1657 matrix to prepare blended
membranes for enhancing the CO2 permeability and comparing
their performance. Afterward, CA as the third generation of supramolecular
hosts with high inherent affinity to CO2 was synthesized
and incorporated in the polymer blends to fabricate high-performance
MMMs. The organic nature, the high compatibility of other applied
additives with Pebax MH 1657 polymer, and the tiny size of CA particles
were responsible for the desirable particle distribution in ternary
MMMs. In the case of the Pebax/PEG550 (30 wt%)/CA (0.5 wt%) MMM, the
results revealed the CO2 permeability to be about 632.60
Barrer, with CO2/CH4 and CO2/N2 selectivities about 59.83 and 139.88, respectively. For Pebax/IL
(6.5 wt%)/CA (0.5 wt%), the CO2 permeability was about
263.82 Barrer, with CO2/CH4 and CO2/N2 selectivities about 64.39 and 152.45, respectively.
Therefore, the fabricated ternary MMMs present a promising outlook
for CO2 separation, which surpasses the Robeson upper limits.
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