RT info:eu-repo/semantics/article
T1 Gas separation by mixed matrix membranes with porous organic polymer Inclusions within o-hydroxypolyamides containing m-terphenyl moieties
A1 Soto Guzmán, Marvelia Cenit
A1 Torres Cuevas, Edwin
A1 González Ortega, Alfonso
A1 Palacio Martínez, Laura
A1 Lozano, Ángel E.
A1 Freeman, Benny D.
A1 Prádanos del Pico, Pedro Lourdes
A1 Hernández Giménez, Antonio
K1 Hydrogen separation
K1 Separación de hidrógeno
K1 Mixed matrix membranes
K1 Membranas de matriz mixta
K1 Porous polymer networks
K1 Redes poliméricas porosas
K1 Thermal rearrangement
K1 Reordenamiento térmico
AB A hydroxypolyamide (HPA) manufactured from 2,2-bis(3-amino-4-hydroxy phenyl)-hexafluoropropane (APAF) diamine and 5′-terbutyl-m-terphenyl-4,4′′-dicarboxylic acid chloride (tBTpCl), and a copolyimide produced by stochiometric copolymerization of APAF and 4,4′-(hexafluoroisopropylidene) diamine (6FpDA), using the same diacid chloride, were obtained and used as polymeric matrixes in mixed matrix membranes (MMMs) loaded with 20% (w/w) of two porous polymer networks (triptycene-isatin, PPN-1, and triptycene-trifluoroacetophenone, PPN-2). These MMMs, and also the thermally rearranged membranes (TR-MMMs) that underwent a thermal treatment process to convert the o-hydroxypolyamide moieties to polybenzoxazole ones, were characterized, and their gas separation properties evaluated for H2, N2, O2, CH4, and CO2. Both TR process and the addition of PPN increased permeability with minor decreases in selectivity for all gases tested. Excellent results were obtained, in terms of the permeability versus selectivity compromise, for H2/CH4 and H2/N2 separations with membranes approaching the 2008 Robeson’s trade-off line. The best gas separation properties were obtained when PPN-2 was used. Finally, gas permeation was characterized in terms of chain intersegmental distance and fraction of free volume of the membrane along with the kinetic diameters of the permeated gases. The intersegmental distance increased after TR and/or the addition of PPN-2. Permeability followed an exponential dependence with free volume and a quadratic function of the kinetic diameter of the gas.
PB MDPI
SN 2073-4360
YR 2021
FD 2021
LK https://uvadoc.uva.es/handle/10324/48908
UL https://uvadoc.uva.es/handle/10324/48908
LA eng
NO Polymers, 2021, vol. 13, n. 6, 931
NO Producción Científica
DS UVaDOC
RD 19-nov-2024