Specific structure and properties of composite membranes based on the Torlon® (polyamide-imide)/layered perovskite oxide

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Abstract

The use of perovskite-type layered oxide K2La2Ti3O10 (Per) as a modifier of the Torlon® polyamide-imide (PAI) membrane has led to the formation of an specific structure of a dense nonsymmetrical film, namely, a thin perovskite-enriched layer (3-5 μm) combined with the polymer matrix (~30 μm). The PAI/Per membrane structure was studied by SEM in combination with energy dispersive microanalysis of the elemental composition which illustrated different compositions of top and bottom surfaces of the perovskite-containing membranes. Measurement of water and alcohol contact angles and calculation of surface tension revealed hydrophilization of the membrane surface enriched with perovskite. The transport properties of the nonsymmetrical PAI/Per membranes were studied in the pervaporation of ethanol-ethyl acetate mixture. The inclusion of 2 wt. % Per in the PAI gives a membrane with a high separation factor and increased total flux.

Original languageEnglish
Article number1142
JournalSymmetry
Volume12
Issue number7
DOIs
StatePublished - Jul 2020

Scopus subject areas

  • Computer Science (miscellaneous)
  • Chemistry (miscellaneous)
  • Mathematics(all)
  • Physics and Astronomy (miscellaneous)

Keywords

  • Composite membrane
  • Critical surface tension
  • Perovskite
  • Pervaporation
  • Polyamide-imide

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