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

✍ Scribed by Akon Higuchi; Tadashi Nakajima; Atsushi Morisato; Michiaki Ando; Kazukiyo Nagai; Tsutomu Nakagawa

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 613 KB
• Volume: 34
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/(sici)1099-0488(19960930)34:13<2153::aid-polb4>3.0.co;2-x

✦ Synopsis

Infrared spectra of CO, 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 CO, were attributed to the R branch and P branch of C 0 2 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 CO, in the membranes were measured from the desorption kinetics of CO, detected by FTIR spectroscopy. The solubility coefficients of COP were also estimated from absorbance spectra of CO, 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.