TY - JOUR
T1 - Transport and structural characteristics of crosslinked poly(ethylene oxide) rubbers
AU - Lin, Haiqing
AU - Wagner, Elizabeth Van
AU - Swinnea, John S.
AU - Freeman, Benny D.
AU - Pas, Steven J.
AU - Hill, Anita J.
AU - Kalakkunnath, Sumod
AU - Kalika, Douglass S.
PY - 2006/5/1
Y1 - 2006/5/1
N2 - 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.
AB - 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.
KW - Carbon dioxide
KW - Free volume
KW - Membrane
KW - Poly(ethylene oxide)
KW - Separation
UR - https://www.scopus.com/pages/publications/33645413837
UR - https://www.scopus.com/inward/citedby.url?scp=33645413837&partnerID=8YFLogxK
U2 - 10.1016/j.aca.2006.03.068
DO - 10.1016/j.aca.2006.03.068
M3 - Article
AN - SCOPUS:33645413837
SN - 0376-7388
VL - 276
SP - 145
EP - 161
JO - Journal of Membrane Science
JF - Journal of Membrane Science
IS - 1-2
ER -