RT info:eu-repo/semantics/article
T1 Gas permeability through polyimides: Unraveling the Influence of free volume, intersegmental distance and glass transition temperature
A1 Torres, Alba
A1 Soto Guzmán, Marvelia Cenit
A1 Carmona, Francisco Javier
A1 Comesaña Gándara, Bibiana
A1 Viuda, Mónica de la
A1 Palacio Martínez, Laura
A1 Prádanos del Pico, Pedro Lourdes
A1 Simorte, María Teresa
A1 Sanz, Inmaculada
A1 Muñoz Torre, Raúl
A1 Tena Matias, Alberto
A1 Hernández Giménez, Antonio
K1 Gas separation membranes
K1 Membrane separation
K1 Gases - Separation
K1 Membranas (Tecnología)
K1 Polymers
K1 Polimeros y polimerización
K1 Glass transition temperature
K1 Glass
K1 2204.05 Gases
K1 2210.19 Fenómenos de Membrana
K1 2206.10 Polímeros
K1 3312.06 Vidrio
AB The relationships between gas permeability and free volume fraction, intersegmental distance, and glass transition temperature, are investigated. They are analyzed for He, CO2, O2, CH4, and N2 gases and for five similar polyimides with a wide range of permeabilities, from very low to extremely high ones. It has been established here that there is an exponential relationship between permeability and the free volume fraction, and between permeability and the most probable intersegmental distance as measured by WAXS; in both cases, with an exponential coefficient that depends on the kinetic gas diameter as a quadratic polynomial and with a preexponential positive constant. Moreover, it has been proven that the intersegmental distance increases linearly with the free volume fraction. Finally, it has been established that the free volume fraction increases with the glass transition temperature for the polymers tested, and that they depend on each other in an approximate linear way.
PB MDPI
SN 2073-4360
YR 2023
FD 2023
LK https://uvadoc.uva.es/handle/10324/67189
UL https://uvadoc.uva.es/handle/10324/67189
LA eng
NO Polymers, 2024, Vol. 16, Nº. 1, 13
NO Producción Científica
DS UVaDOC
RD 27-dic-2024