RT info:eu-repo/semantics/article T1 Influence of the PEO length in gas separation properties of segregating aromaticaliphatic copoly(ether-imide)s A1 Tena Matías, Alberto A1 Marcos Fernández, Ángel A1 Lozano, Ángel E. A1 Abajo, Javier de A1 Palacio Martínez, Laura A1 Prádanos del Pico, Pedro Lourdes A1 Hernández Giménez, Antonio K1 Membranes K1 Polymers K1 Separations K1 Selectivity K1 Copoly(ether-imide) K1 Carbon dioxide AB A complete series of aliphatic-aromatic copoly(ether-imide)s has been synthesized inthis work. All these copoly(ether-imide)s had the same structure, BPDA-PEOX-ODA,but different lengths of PEO in the final polymer. These copolymers have beenthermally treated and characterized by several techniques. A direct relationship betweenthe temperature of treatment, the improvement of phase segregation, and permeabilityhas been demonstrated.The Maxwell model has been applied to predict permeability (for CO2, CH4 and N2) andit has been found that when the segregated PEO can be considered to be amorphous – itis at high temperatures when crystallinity disappears – the model fits reasonably well.This confirms that the aliphatic and aromatic portions of the copolymer behaveapproximately as a bi-phase of disperse domains within a continuous matrix.Results show that permeability is higher when the PEO chains are longer – when thereis no crystallinity, or any kind of internal bonds, distorting the results – while selectivitydoesn´t depend on the PEO length in the copolymer. Remarkable are the results for theCO2/N2 gas pair, with selectivity-versus-permeability very near to the Robeson‘s upperbound at 30 ºC and even in closer proximity to the corresponding trade off line forhigher permeation temperatures. PB Elsevier SN ISSN: 0009-2509 YR 2013 FD 2013 LK http://uvadoc.uva.es/handle/10324/21891 UL http://uvadoc.uva.es/handle/10324/21891 LA eng NO Chemical Engineering Science, 2013, Volume 104, p. 574–585 NO Producción Científica DS UVaDOC RD 28-mar-2024