2026-05-05T13:23:37Zhttps://uvadoc.uva.es/oai/request
oai:uvadoc.uva.es:10324/671892025-09-09T10:25:28Zcom_10324_1157com_10324_931com_10324_894col_10324_1298
UVaDOC author Torres Arribas, Alba author Soto Guzmán, Marvelia Cenit author Carmona Del Rio, Francisco Javier author Comesaña Gandara, Bibiana author Viuda Caíña, Mónica Rosa de la author Palacio Martínez, Laura author Prádanos del Pico, Pedro Lourdes author Simorte, María Teresa author Sanz Mateos, María Inmaculada author Muñoz Torre, Raúl author Tena Matias, Alberto author 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 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. eng Atribución 4.0 Internacional Gas separation membranes Membrane separation Gases - Separation Membranas (Tecnología) Polymers Polimeros y polimerización Glass transition temperature Glass Gas permeability through polyimides: Unraveling the Influence of free volume, intersegmental distance and glass transition temperature info:eu-repo/semantics/article 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URL https://uvadoc.uva.es/bitstream/10324/67189/1/Gas-Permeability-through-Polyimides.pdf File MD5 54e5c6cc6cd5624ce863902b81a3dfa0 1085102 application/pdf Gas-Permeability-through-Polyimides.pdf