160907 20251017144615.0 doi 10.1016/j.jece.2025.116893 sideral 144073 ART-2025-144073 eng Martínez-Visus, Íñigo Universidad de Zaragoza (orcid)0000-0003-4789-4649 Study for CO2 separation with poly(ethylene oxide terephthalate)-poly(butylene terephthalate) multiblock copolymer membranes: Approaching a greener solvent preparation 2025 Access copy available to the general public Unrestricted Green solvent alternatives for the multiblock copolymer PolyActive™ were selected to test their effectiveness in membrane fabrication for gas separation. Solubility tests were conducted to assess the solvent-polymer compatibility, followed by membrane fabrication using a drop casting-solution method. Ethyl lactate was identified as a potential greener solvent, compared to more commonly used solvents like chloroform and tetrahydrofuran, as it maintained the membrane conformation, thermal and chemical stability, and thermal degradation characteristics as demonstrated by membrane characterization using SEM, FTIR, TGA and DSC. Single gas transport parameters (permeability, diffusivity and solubility) for N2, H2, CH4, He and CO2 were obtained via the time-lag method for the prepared membranes. A temperature dependence study was conducted in the 25–70 °C range, calculating activation energies for gas transport properties and ideal selectivities. Mixed gas measurements were also performed, comparing separation selectivities to those (ideal selectivities) obtained in single gas, indicating a potential competitive adsorption effect between less permeable species, leading to more selective separation in gas mixture. Membranes prepared with different polymer concentrations (1, 2 and 5 wt%) in ethyl lactate achieve a CO2/N2 ideal selectivity of up to 50.4 at a CO2 permeability of 179 Barrer. This enhanced performance was attributed to ethyl lactate higher boiling point, resulting in a more densely packed polymer structure as reflected by the higher crystallinity and lower fractional free volume measured through XRD, DSC and pycnometry analyses. info:eu-repo/grantAgreement/ES/DGA/T68-23R info:eu-repo/grantAgreement/ES/MICINN PRE2020-092006 info:eu-repo/grantAgreement/ES/MICIU/CEX2023-001286-S info:eu-repo/grantAgreement/ES/MICIU/PID2019-104009RB-I00 info:eu-repo/grantAgreement/ES/MICIU/PID2022-138582OB-I00 info:eu-repo/semantics/openAccess by-nc-nd https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Téllez, Carlos Universidad de Zaragoza (orcid)0000-0002-4954-1188 Coronas, Joaquín Universidad de Zaragoza (orcid)0000-0003-1512-4500 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 13, 3 (2025), 116893 [14 pp.] J. env. chem. eng. Journal of Environmental Chemical Engineering 2213-3437 2640191 http://zaguan.unizar.es/record/160907/files/texto_completo.pdf Versión publicada 2563166 http://zaguan.unizar.es/record/160907/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:160907 articulos driver 2025-10-17-14:18:57 ARTICLE