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Gas transport coefficients of phthalide-containing high-T<inf>g</inf> glassy polymers determined by gas-flux and NMR measurements

AuthorsGarcía, Carolina ; Lozano López, Ángel Emilio ; Campa, José G. de la; Vygoskii, Y.; Zolotukhin, M.; Abajo González, Javier de ; Garrido, Leoncio ; Guzmán, Julio
Issue Date2015
PublisherAmerican Chemical Society
CitationMacromolecules 48: 2585-2592 (2015)
AbstractThe synthesis of three aromatic polymers containing phthalide cardo groups having high inherent viscosities is described. Polyimides PIC-6F and PIC-TB were prepared from a cardo diamine and two different dianhydrides, and poly(phthalidylidenearylene) (PPDAr) was prepared by a precipitative Friedel-Crafts homopolycondensation of 3-(4-biphenylyl)-3-chlorophthalide. All polymers presented high glass transition temperatures varying between 600 and 690 K. Dense membranes prepared by casting from N,N-dimethylacetamide solutions exhibited good mechanical properties and decomposition temperatures over 770 K under a N<inf>2</inf> atmosphere. Results of gas transport measurements of O<inf>2</inf>, N<inf>2</inf>, and CO<inf>2</inf> were comparatively analyzed based on the chemical structure of the polymers. Additionally, the solubility, diffusion, and permeability coefficients of [<sup>13</sup>C]O<inf>2</inf> in these membranes were determined by <sup>13</sup>C NMR spectroscopy and pulsed-field gradient NMR measurements, and the results were in good agreement with those determined with pressure-driven measurements. It was found that membranes of PPDAr exhibited the highest permeability and CO<inf>2</inf>/N<inf>2</inf> and CO<inf>2</inf>/O<inf>2</inf> permselectivities.
Identifiersdoi: 10.1021/acs.macromol.5b00183
issn: 0024-9297
e-issn: 1520-5835
Appears in Collections:(ICTP) Artículos
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