Gas transport properties of rubbery cross-linked poly(ethylene oxide) films containing short phenoxy-terminated pendant chains are reported. Poly(ethylene glycol) diacrylate (PEGDA) was UV-polymerized with poly(ethylene glycol) phenyl ether acrylate co-monomers of two different ethylene oxide repeat unit lengths: n = 2 (DEGPEA) and n = 4 (PEGPEA). Although fractional free volume increased with increasing co-monomer concentration, gas permeability did not rise accordingly. For instance, while FFV increased from 0.120 to 0.135 in both series of copolymers, CO2 permeability went from 110 to 35 barrer (DEGPEA) or to 100 barrer (PEGPEA). At the same time, glass transition temperature increased from -37 to -12 °C (DEGPEA) or to -28 °C (PEGPEA). The observed decrease in chain mobility with phenoxy-terminated co-monomer content indicated by increasing glass-rubber transition temperature apparently had a stronger influence on gas transport properties than the increase in fractional free volume.
|Number of pages||12|
|Journal||Journal of Membrane Science|
|State||Published - Sep 30 2009|
Bibliographical noteFunding Information:
We gratefully acknowledge partial support of this work by the U.S. Department of Energy (Grant DE-FG02-02ER15362) and by the U.S. National Science Foundation (Grant CBET-0515425). Activities at the University of Kentucky were supported by a grant from the Kentucky Science and Engineering Foundation as per Grant Agreement KSEF-148-502-05-130 with the Kentucky Science and Technology Corporation. The authors would like to thank Dr. Angel E. Lozano of Instituto de Ciencia y Tecnología de Polímeros (Madrid, Spain) and Dr. Donald R. Paul of the University of Texas at Austin for helpful discussions regarding some aspects of this work.
- Chain mobility
- Cross-linked poly(ethylene oxide)
- Fractional free volume
- Light gas separation
- Structure/property relationship
ASJC Scopus subject areas
- Materials Science (all)
- Physical and Theoretical Chemistry
- Filtration and Separation