RT info:eu-repo/semantics/article
T1 Gas adsorption isotherm, pore size distribution, and free volume fraction of polymer-polymer mixed matrix membranes before and after thermal rearrangement
A1 Soto Guzmán, Marvelia Cenit
A1 Cicuttin, Noelia
A1 Carmona del Río, Francisco Javier
A1 Viuda, Mónica de la
A1 Tena Matias, Alberto
A1 Lozano, Ángel E.
A1 Hernández Giménez, Antonio
A1 Palacio Martínez, Laura
A1 Prádanos del Pico, Pedro Lourdes
K1 Materials—Surfaces
K1 Ingeniería química
K1 Polimeros y polimerización
K1 CO2 adsorption
K1 Free volume
K1 Porous polymer networks
K1 Adsorción de CO2
K1 Volumen libre
K1 Redes de polímeros porosos
K1 3303 Ingeniería y Tecnología Químicas
AB In this work, CO2 adsorption at 273.15 K and N2 adsorption at 77 K of mixed matrix membranes has been studied, as a method to directly determine their fractional free volume (FFV). These membranes consist of a continuous phase of copoly(o-hydroxyamide)s (HPA) or copoly(o-hydroxyamide-amide)s (PAA) and a relatively highly porous polymer network filler (PPN1). Both the pure copolymers and the mixed matrix membranes (MMMs) have been analyzed before and after a thermal rearrangement (TR) process. The CO2 adsorption results have allowed characterizing the pore size distribution of the studied membranes in the 3–15 Å range, by using the Non-Local Density Functional Theory (NLDFT). Whereas the N2 adsorption has allowed determining the pore size distributions in the range between 20 and 250 Å. The experimental determination of the pore volume and the density allows the direct calculation of the membranes’ free volume fractions, which were in good agreement with the most usual FFV evaluation methods. In addition, part of the pore volume detected by N2 adsorption was associated with defects and poor integration of the membrane components. This correction has allowed us to make a new evaluation of the density of these materials.
PB Elsevier
SN 0376-7388
YR 2023
FD 2023
LK https://uvadoc.uva.es/handle/10324/59961
UL https://uvadoc.uva.es/handle/10324/59961
LA eng
NO Journal of Membrane Science, 2023, Volume 683, 121841
NO Producción Científica
DS UVaDOC
RD 22-dic-2024