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2023-05-02T07:40:07Z urn:hdl:10324/59443 Gas separation membranes obtained by partial pyrolysis of polyimides exhibiting polyethylene oxide moieties Matesanz Niño, Laura Aguilar Lugo, Carla Prádanos del Pico, Pedro Lourdes Hernández Giménez, Antonio Bartolomé Albistegui, María del Camino Campa, José G. de la Palacio Martínez, Laura González Ortega, Alfonso Galizia, Michele Álvarez, Cristina Lozano, Ángel E. Producción Científica Aromatic copolyimides (PIx) and aromatic-aliphatic copolyimides (PIxEOy) were synthesized by reacting 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) with mixtures obtained from 2,2′-bis(4-aminophenyl)hexafluoropropane (6FpDA), 5-diaminobenzoic acid (DABA) and Jeffamine ED-2003 (PEO). The selective thermal removal of PEO from PIxEOy yielded membranes with high thermal stability and good mechanical properties. The presence of carboxylic groups minimized the shrinkage during the cross-linking process. The membranes containing 10 mol% DABA exhibited good O2/N2 and CO2/CH4 separation performance, and resistance to CO2 plasticization. PIx/PIxEOy blends containing less than 10 wt% PEO were prepared. The CO2/CH4 selectivity/permeability balance of cross-linked membranes largely exceeded that of PIx. The results highlight a possible strategy for using analogous cross-linkable polymers exhibiting ethylene oxide moieties as mere additive to prepare high free volume polyimide's membranes, exhibiting enhanced separation properties and high resistance to plasticization. 2023-05-02T07:40:07Z 2023-05-02T07:40:07Z 2022 info:eu-repo/semantics/article Polymer Volume 247, 28 April 2022, 124789 0032-3861 https://uvadoc.uva.es/handle/10324/59443 10.1016/j.polymer.2022.124789 124789 Polymer 247 eng https://www.sciencedirect.com/science/article/pii/S0032386122002762?via%3Dihub info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ © 2022 The Authors Attribution-NonCommercial-NoDerivatives 4.0 Internacional Elsevier