RT info:eu-repo/semantics/article
T1 Free volume and permeability of mixed matrix membranes made from a Terbutil-M-terphenyl polyamide and a porous polymer network
A1 Soto Guzmán, Marvelia Cenit
A1 Carmona del Río, Francisco Javier
A1 Freeman, Benny D.
A1 Palacio Martínez, Laura
A1 González Ortega, Alfonso
A1 Prádanos del Pico, Pedro Lourdes
A1 Lozano, Ángel E.
A1 Hernández Giménez, Antonio
K1 Hydrogen
K1 Inorganic Chemistry
K1 Gas separation membranes
K1 Gases - Separation
K1 Membranas (Tecnología)
K1 Polimers
K1 Polímeros y polimerización
K1 Polymer networks
K1 Mixed matrix membranes
K1 2303.14 Hidrogeno
K1 2303 Química Inorgánica
AB A set of thermally rearranged mixed matrix membranes (TR-MMMs) was manufactured and tested for gas separation. These membranes were obtained through the thermal treatment of a precursor MMM with a microporous polymer network and an o-hydroxypolyamide,(HPA) created through a reaction of 2,2-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane (APAF) and 5′-terbutil-m-terfenilo-3,3″-dicarboxylic acid dichloride (tBTmCl). This HPA was blended with different percentages of a porous polymer network (PPN) filler, which produced gas separation MMMs with enhanced gas permeability but with decreased selectivity. The thermal treatment of these MMMs gave membranes with excellent gas separation properties that did not show the selectivity decreasing trend. It was observed that the use of the PPN load brought about a small decrease in the initial mass losses, which were lower for increasing PPN loads. Regarding the glass transition temperature, it was observed that the use of the filler translated to a slightly lower Tg value. When these MMMs and TR-MMMs were compared with the analogous materials created from the isomeric 5′-terbutil-m-terfenilo-4,4″-dicarboxylic acid dichloride (tBTpCl), the permeability was lower for that of tBTmCl, compared with the one from tBTpCl, although selectivity was quite similar. This fact could be attributed to a lower rigidity as roughly confirmed by the segmental length of the polymer chain as studied by WAXS. A model for FFV calculation was proposed and its predictions compared with those evaluated from density measurements assuming a matrix-filler interaction or ideal independence. It turns out that permeability as a function of FFV for TR-MMMs follows an interaction trend, while those not thermally treated follow the non-interaction trend until relatively high PPN loads were reached.
PB MDPI
SN 2073-4360
YR 2022
FD 2022
LK https://uvadoc.uva.es/handle/10324/60738
UL https://uvadoc.uva.es/handle/10324/60738
LA eng
NO Polymers, 2022, Vol. 14, Nº. 15, 3176
NO Producción Científica
DS UVaDOC
RD 27-nov-2024