Estimation of diffusion and permeability coefficients of CO2 in polymeric membranes by FTIR method

Akon Higuchi, Tadashi Nakajima, Atsushi Morisato, Michiaki Ando, Kazukiyo Nagai, Tsutomu Nakagawa

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Infrared spectra of CO2 sorbed in rubbery and glassy polymeric membranes were measured to examine the relationships between the spectroscopic data and the physical properties of the membranes. The two peaks observed in the spectra of CO2 were attributed to the R branch and P branch of CO2 sorbed in the membranes based on the consideration that both peaks were observed at a temperature above the glass transition temperature of the membranes. Apparent diffusion coefficients of CO2 in the membranes were measured from the desorption kinetics of CO2 detected by FTIR spectroscopy. The solubility coefficients of CO2 were also estimated from absorbance specta of CO2 sorbed in the membranes using Lambert-Beer's rule. The permeability, solubility, and diffusion coefficients estimated by the FTIR method were found to correlate well with the coefficients obtained by conventional methods such as vacuum-pressure or sorption isotherm methods.

Original languageEnglish
Pages (from-to)2153-2160
Number of pages8
JournalJournal of Polymer Science, Part B: Polymer Physics
Issue number13
StatePublished - 30 Sep 1996


  • Diffusion
  • Dual-mode sorption
  • Infrared spectroscopy
  • Membrane
  • Permeation


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