The effect of aryl nitration on gas sorption and permeation in polysulfone

Kanchan Ghosal, Rey T. Chern, Benny D. Freeman, Raj Savariar

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CO2, CH4, O2, and N2 permeability and solubility of unmodified and aryl‐nitrated polysulfone were determined at 35°C and pressures up to 20 atm. The degree of nitration was varied from 0 to 2 nitro groups per repeat unit. The permeability and diffusion coefficients for all gases decreased with increasing degree of nitro substitution. The decrease in gas diffusivity is attributed to a combination of decreased fractional free volume and decreased torsional mobility with increasing degree of substitution. The solubilities of N2, O2, and CH4 do not show a systematic dependence on degree of substitution. However, CO2 solubility apparently goes through a minimum as the degree of substitution is increased. CO2 solubility may be influenced by a competition between increases in polymer polarity (favoring higher solubility) and lower free volume (favoring lower solubility) that accompanies increases in the polar nitro substituent concentration. CO2/CH4 solubility selectivity increases monotonically as the degree of substitution increases. CO2/CH4 permselectivity and diffusivity selectivity increased with increasing degree of substitution. © 1995 John Wiley & Sons, Inc.

Original languageEnglish
Pages (from-to)657-666
Number of pages10
JournalJournal of Polymer Science Part B: Polymer Physics
Issue number4
Publication statusPublished - Mar 1995
Externally publishedYes


  • aryl nitration
  • permeability
  • polysulfone
  • solubility

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