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Título
Gas separation by mixed matrix membranes with porous organic polymer Inclusions within o-hydroxypolyamides containing m-terphenyl moieties
Autor
Año del Documento
2021
Editorial
MDPI
Descripción
Producción Científica
Documento Fuente
Polymers, 2021, vol. 13, n. 6, 931
Abstract
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.
Palabras Clave
Hydrogen separation
Separación de hidrógeno
Mixed matrix membranes
Membranas de matriz mixta
Porous polymer networks
Redes poliméricas porosas
Thermal rearrangement
Reordenamiento térmico
ISSN
2073-4360
Revisión por pares
SI
Patrocinador
Agencia Estatal de Investigación (projects PID2019-109403RB-C21 and PID2019-109403RB-C22)
Junta de Castilla y León - Fondo Europeo de Desarrollo Regional (projects CLU2017-09, UIC082 and VA088G19)
Junta de Castilla y León - Fondo Europeo de Desarrollo Regional (projects CLU2017-09, UIC082 and VA088G19)
Version del Editor
Propietario de los Derechos
© 2021 MDPI
Idioma
eng
Tipo de versión
info:eu-repo/semantics/publishedVersion
Derechos
openAccess
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