Polyimides Containing Biphenyl and Troger's Base Units for Gas Separation Membranes

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dc.contributor.authorRodriguez, Ary
dc.contributor.authorTundidor, Maria Victoria Velazquez
dc.contributor.authorCruz, Yennier
dc.contributor.authorRodriguez-Gonzalez, Fidel Ernesto
dc.contributor.authorAguilar-Vega, Manuel J.
dc.contributor.authorSulub-Sulub, Rita
dc.contributor.authorRavula, Sudhir
dc.contributor.authorBara, Jason E.
dc.contributor.authorTerraza, Claudio A.
dc.contributor.authorTundidor-Camba, Alain
dc.date.accessioned2025-01-20T17:07:48Z
dc.date.available2025-01-20T17:07:48Z
dc.date.issued2024
dc.description.abstractTwo diamine monomers containing biphenyl and Tr & ouml;ger's base units were synthesized, and each diamine that differed by the presence of two -CH3 groups was reacted with commercially 4,4 '-hexafluoroisopropylidene diphthalic anhydride (6FDA) for obtaining two polyimides of intrinsic microporosity (PIM-TB-PI-1 and PIM-TB-PI-2) with structural elements that ensured the formation of contorted and semirigid chains. Both PIM-PIs were soluble in polar aprotic solvents, including tetrahydrofuran and chloroform, showing high thermal stability (T-d > 500 degrees C) and high glass transition temperatures (T-g > 300 degrees C). The surface area and the distance between polymer chains were determined by using N-2 adsorption/desorption and wide-angle X-ray diffraction (XRD) techniques, respectively. PIM-TB-PI-1 showed a surface area of 81 m(2) g(-1) and d-spacing of 5.9 & Aring;, while PIM-TB-PI-2 had slightly higher values (SA = 109 m(2) g(-1) and d-spacing = 6.3 & Aring;). PIM-TB-PI-1 and PIM-TB-PI-2 form dense films that exhibited pure gas permeability coefficients that are 1 order of magnitude higher than Matrimid while they present lower perm-selectivities than the former. This result is related to chain rigidity in PIM-TB-PIs that maintains a distribution of microvoids that are large enough for these gases to diffuse through the interconnected free volume, and the TB units in the main chain of both polymers increase steric hindrance for gas permeability and diffusion. The higher diffusion coefficients of PIM-TB-PI-2, as compared to PIM-TB-PI-1 are related to the presence of -CH3 groups near the imide group, preventing an efficient packing of the polymer chains.
dc.fuente.origenWOS
dc.identifier.doi10.1021/acsapm.3c03193
dc.identifier.issn2637-6105
dc.identifier.urihttps://doi.org/10.1021/acsapm.3c03193
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/90896
dc.identifier.wosidWOS:001181189800001
dc.issue.numero6
dc.language.isoen
dc.pagina.final3353
dc.pagina.inicio3342
dc.revistaAcs applied polymer materials
dc.rightsacceso restringido
dc.subjectpolyimides of intrinsicmicroporosity
dc.subjectTro''ger'sbase
dc.subjectbiphenyl
dc.subjectgas separation
dc.subjectpolymermembranes
dc.subject.ods13 Climate Action
dc.subject.odspa13 Acción por el clima
dc.titlePolyimides Containing Biphenyl and Troger's Base Units for Gas Separation Membranes
dc.typeartículo
dc.volumen6
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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