TY - JOUR
T1 - Hydrogen sorption in polymers for membrane applications
AU - Smith, Zachary P.
AU - Tiwari, Rajkiran R.
AU - Murphy, Thomas M.
AU - Sanders, David F.
AU - Gleason, Kristofer L.
AU - Paul, Donald R.
AU - Freeman, Benny D.
N1 - Funding Information:
Partial support for this research was provided by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences of the U.S. Department of Energy (DOE) through Grant DE-FG02-02ER15362 . The authors gratefully thank the DOE for their funding, which was used to support equipment needed to determine sorption. The authors are also grateful for funding provided by Phillips 66 ® . Additionally, funding was provided by the DOE Office of Science Graduate Fellowship Program, which is administered by the Oak Ridge Institute for Science and Education (ORISE). ORISE is managed by Oak Ridge Associated Universities (ORAU) under DOE contract number DE-AC05-06OR23100. The work was also partially supported by the U.S. National Science Foundation under Grant No. DMR #0423914 and by the NSF's Partnership for Innovation (PFI) Program ( Grant # IIP-1237857 ).
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2013/5/24
Y1 - 2013/5/24
N2 - Hydrogen sorption between -20 C and 70 C and at pressures up to 60 bara was determined for a polyimide and corresponding thermally rearranged (TR) polymers prepared from 3,3′-dihydroxy-4,4′-diamino-biphenyl (HAB) and 2,2′-bis-(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA). Hydrogen sorption increased by a factor of approximately 2.6 between the polyimide precursor and the most highly converted TR polymer. This relative increase in sorption was similar to that observed for other non-polar light gases such as N2, O2, and CH4, but less than that observed for CO2. Additionally, H2 sorption was measured for other polymers commonly studied in the membrane literature, including AF 2400, Matrimid®, polysulfone, and poly(dimethylsiloxane). Among the glassy polymers tested, polysulfone had the lowest H2 sorption, and the HAB-6FDA TR polymer had the highest H2 sorption. A slight dual-mode curvature was observed for H 2 sorption in several of the glassy materials, and it was most pronounced at low temperatures and for the TR polymers. Enthalpies of sorption were also determined. The most exothermic enthalpy of sorption occurred in Matrimid®, and a slightly endothermic enthalpy of sorption was observed in rubbery poly(dimethylsiloxane). Comparisons between gravimetric and volumetric sorption showed similar results.
AB - Hydrogen sorption between -20 C and 70 C and at pressures up to 60 bara was determined for a polyimide and corresponding thermally rearranged (TR) polymers prepared from 3,3′-dihydroxy-4,4′-diamino-biphenyl (HAB) and 2,2′-bis-(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA). Hydrogen sorption increased by a factor of approximately 2.6 between the polyimide precursor and the most highly converted TR polymer. This relative increase in sorption was similar to that observed for other non-polar light gases such as N2, O2, and CH4, but less than that observed for CO2. Additionally, H2 sorption was measured for other polymers commonly studied in the membrane literature, including AF 2400, Matrimid®, polysulfone, and poly(dimethylsiloxane). Among the glassy polymers tested, polysulfone had the lowest H2 sorption, and the HAB-6FDA TR polymer had the highest H2 sorption. A slight dual-mode curvature was observed for H 2 sorption in several of the glassy materials, and it was most pronounced at low temperatures and for the TR polymers. Enthalpies of sorption were also determined. The most exothermic enthalpy of sorption occurred in Matrimid®, and a slightly endothermic enthalpy of sorption was observed in rubbery poly(dimethylsiloxane). Comparisons between gravimetric and volumetric sorption showed similar results.
KW - Dual-mode sorption
KW - Membrane gas separation
KW - TR polymers
UR - http://www.scopus.com/inward/record.url?scp=84877717934&partnerID=8YFLogxK
U2 - 10.1016/j.polymer.2013.04.006
DO - 10.1016/j.polymer.2013.04.006
M3 - Article
AN - SCOPUS:84877717934
SN - 0032-3861
VL - 54
SP - 3026
EP - 3037
JO - Polymer
JF - Polymer
IS - 12
ER -