RT info:eu-repo/semantics/article
T1 Mixed matrix membranes loaded with a porous organic polymer having bipyridine moieties
A1 Rico Martínez, Sandra
A1 Álvarez, Cristina
A1 Hernández Giménez, Antonio
A1 Miguel García, Jesús Ángel
A1 Lozano, Ángel E.
K1 Polymers
K1 Polímeros y polimerización
K1 Gases - Separation
K1 Polyimides
K1 Porous materials
K1 Carbon dioxide
K1 Mixed matrix membranes
K1 CO2 capture
AB Mixed matrix membranes (MMMs), derived from three aromatic polyimides (PIs), and an affordable porous organic polymer (POP) having basic bipyridine moieties were prepared. Matrimid and two fluorinated polyimides, which were derived from 4,4′-(hexafluoroisopropylidene)diphthalic anhydride and 2,2′-bis(4-aminophenyl)hexafluoropropane (6F6F) or 2,4,6-trimethyl-m-phenylenediamine (6FTMPD), were employed as polymer matrixes. The used POP was a highly microporous material (surface area of 805 m2 g−1) with excellent thermal and chemical stability. The MMMs showed good compatibility between the PIs and POP, high thermal stabilities and glass transition temperatures superior to those of the neat PI membranes, and good mechanical properties. The addition of POP to the matrix led to an increase in the gas diffusivity and, thus, in permeability, which was associated with an increase in the fractional free volume of MMMs. The increase in permeability was higher for the less permeable matrix. For example, at 30 wt.% of POP, the permeability to CO2 and CH4 of the MMMs increased by 4- and 7-fold for Matrimid and 3- and 4-fold for 6FTMPD. The highest CH4 permeability led to a decrease in CO2/CH4 selectivity. The CO2/N2 separation performance was interesting, as the selectivity remained practically constant. Finally, the POP showed no molecular sieving effect towards the C2H4/C2H6 and C3H6/C3H8 gas pairs, but the permeability increased by about 4-fold and the selectivity was close to that of the matrix. In addition, because the POP can form metal ion bipyridine complexes, modified POP-based MMMs could be employed for olefin/paraffin separations.
PB MDPI
SN 2077-0375
YR 2022
FD 2022
LK https://uvadoc.uva.es/handle/10324/59317
UL https://uvadoc.uva.es/handle/10324/59317
LA eng
NO Membranes, 2022, Vol. 12, Nº. 6, 547
NO Producción Científica
DS UVaDOC
RD 19-nov-2024