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    Por favor, use este identificador para citar o enlazar este ítem:https://uvadoc.uva.es/handle/10324/72681

    Título
    Thermally treated copoly(ether-imide)s made from bpda and alifatic plus aromatic diamines. GAS separation properties with different aromatic diamines
    Autor
    Tena Matias, AlbertoAutoridad UVA Orcid
    Marcos-Fernandez, Angel
    Lozano, Angel E.
    de la Campa, Jose G.
    de Abajo, Javier
    Palacio Martínez, LauraAutoridad UVA Orcid
    Prádanos del Pico, Pedro LourdesAutoridad UVA Orcid
    Hernández Giménez, AntonioAutoridad UVA Orcid
    Año del Documento
    2012
    Editorial
    Elsevier
    Documento Fuente
    Journal of Membrane Science 387– 388 (2012) 54– 65
    Resumen
    A set of copoly(ether-imide)s, formed by the reaction between an aromatic dianhydride (BPDA), a polyoxyalkyleneamine (poly(ethylene oxide) diamino terminated) (PEO-2000) and various aromatic diamines (PPD, BNZ, and ODA) under different thermal treatments, has been obtained and characterized. The existence of phase segregation in these copolymers has been confirmed by SAXS. It has also been proved that aromatic diamines having a hinge group, such as ODA, produce bigger segregated domains while short and rigid aromatic diamines give higher percentages of phase segregation. A direct relationship between gas permeability and percentage, and size of the domains, of the segregated phase has been obtained. Also, higher or similar selectivities have been observed as a function of the thermal treatment. In such way, the use of high temperatures during the thermal treatment, responsible of the improvement of the phase segregation, enhances the gas properties, producing materials with permeability/selectivity values close to the Robeson limit. In the case of the CH4/N2 pair an interesting reverse selectivity has been observed probably due both to a specific interaction of the gas with the polymer and to an increase in the solubility of CH4 in the soft segregated portions of the copolymer. The use of PPD as comonomer provides more phase segregation while the use of ODA gives bigger segregated domains. In terms of permselectivity the performances, for all the pairs of gases studied, follow the PPD > BNZ > ODA sequence when relatively low treatment temperatures are used while quite similar results for BNZ and ODA were observed when higher treatment temperatures are employed. This seems to indicate that the domains size is a key factor in the gas separation properties with a certain influence of the percentage of segregation. An adequate balance of short length with limited rigidity of the aromatic part should improve the properties of this kind of materials.
    Revisión por pares
    SI
    DOI
    10.1016/j.memsci.2011.10.008
    Patrocinador
    Ministry of Science and Innovation MAT2008-00619/MAT
    Ministry of Science and Innovation CIT-420000-2009-32
    Ministry of Science and Innovation MAT2010-20668/MAT
    Consolider Ingenio 2010 (project CSD-0050 MULTICAT)
    Version del Editor
    https://www.sciencedirect.com/science/article/pii/S0376738811007587
    Propietario de los Derechos
    elsevier
    Idioma
    spa
    URI
    https://uvadoc.uva.es/handle/10324/72681
    Tipo de versión
    info:eu-repo/semantics/submittedVersion
    Derechos
    openAccess
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    Universidad de Valladolid

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