Transport and structural characteristics of crosslinked poly(ethylene oxide) rubbers

Haiqing Lin, Elizabeth Van Wagner, John S. Swinnea, Benny D. Freeman, Steven J. Pas, Anita J. Hill, Sumod Kalakkunnath, Douglass S. Kalika

Research output: Contribution to journalArticlepeer-review

170 Scopus citations

Abstract

The removal of CO2 from mixtures with light gases (H2 and CH4) is an important industrial process. Three series of crosslinked poly(ethylene oxide) rubbers were prepared by photopolymerization of prepolymer solutions containing: poly(ethylene glycol) diacrylate (PEGDA) and H2O, PEGDA and poly(ethylene glycol) methyl ether acrylate (PEGMEA), and PEGDA and poly(ethylene glycol) acrylate. PEGDA/PEGMEA-9 exhibited higher gas permeability than PEGDA/PEGMEA-30 at above the crystal melting temperature due to the higher content of PEGMEA in the former material. XLPEGDA-80, PEGDA/PEGMEA-30, and PEGDA/PEGMEA-9 exhibited very similar CO2 and CH4 solubility over the temperature range encompassed by the measurements, and the polymers were amorphous. Increasing PEGMEA content increased the size of the free volume elements, which led to the increased CO2 permeability and CO2/H2 selectivity and decreased CO2/CH4 and CO2/N2 selectivity, but did little to change the concentration of the free volume elements. As the separations moved from those demanding high diffusivity selectivity (H2/CH4) to ones benefiting from high solubility selectivity (CO2/H2), the performance of the polar rubbers improved significantly relative to that of conventional glassy polymers.

Original languageEnglish
Pages (from-to)145-161
Number of pages17
JournalJournal of Membrane Science
Volume276
Issue number1-2
DOIs
StatePublished - May 1 2006

Keywords

  • Carbon dioxide
  • Free volume
  • Membrane
  • Poly(ethylene oxide)
  • Separation

ASJC Scopus subject areas

  • Biochemistry
  • General Materials Science
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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