2026-04-27T21:46:37Zhttps://uvadoc.uva.es/oai/requestoai:uvadoc.uva.es:10324/671892025-09-09T10:25:28Zcom_10324_1157com_10324_931com_10324_894col_10324_1298
Torres Arribas, Alba
Soto Guzmán, Marvelia Cenit
Carmona Del Rio, Francisco Javier
Comesaña Gandara, Bibiana
Viuda Caíña, Mónica Rosa de la
Palacio Martínez, Laura
Prádanos del Pico, Pedro Lourdes
Simorte, María Teresa
Sanz Mateos, María Inmaculada
Muñoz Torre, Raúl
Tena Matias, Alberto
Hernández Giménez, Antonio
2024-04-17T08:29:23Z
2024-04-17T08:29:23Z
2023
Polymers, 2024, Vol. 16, Nº. 1, 13
2073-4360
https://uvadoc.uva.es/handle/10324/67189
10.3390/polym16010013
13
1
Polymers
16
2073-4360
Producción Científica
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.
Ministerio de Ciencia e Innovación/Agencia Estatal de Investigación (AEI)/10.13039/501100011033 y Unión Europea NextGenerationEU/PRTR - (Project TED2021-131170A-I00)
Unión Europea NextGenerationEU - (project MIG-202111071)
Junta de Castilla y León y Unión Euopea (UE)-Fondo Europeo de Desarrollo Regional (FEDER) - (programs CL-EI-2021-07 and UIC082))
application/pdf
eng
MDPI
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
© 2023 The authors
Atribución 4.0 Internacional
Gas separation membranes
Membrane separation
Gases - Separation
Membranas (Tecnología)
Polymers
Polimeros y polimerización
Glass transition temperature
Glass
2204.05 Gases
2210.19 Fenómenos de Membrana
2206.10 Polímeros
3312.06 Vidrio
Gas permeability through polyimides: Unraveling the Influence of free volume, intersegmental distance and glass transition temperature
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.mdpi.com/2073-4360/16/1/13
SI