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Asymmetric nafion/(zirconium oxide) hybrid membranes via in situ sol-gel chemistry

✍ Scribed by W. Apichatachutapan; R. B. Moore; K. A. Mauritz

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
791 KB
Volume
62
Category
Article
ISSN
0021-8995

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✦ Synopsis

SYNOPSIS

Nafion-in situ sol-gel reactions were affected for Zr(OBu), that permeated low water content membranes unidirectionally. IR peaks reflecting ZrO, and incomplete hydrolysis of ZrOBu groups near both surfaces were detected. Vibrations of Zr(OEt), detected near both sides arise from alkoxy exchange in the presence of the solvent EtOH. Unreacted alkoxy group bands are more distinct near the nonpermeated surface. An IR band for the ZnOBu group diminishes, whereas that for ZnOEt increases with increasing time near the permeated surface due to progressive alkoxy exchange. The ZrO, band becomes more intense with time near the permeated surface. X-ray spectroscopy/scanning electron microscopy studies of Zr concentration across the membrane thickness verified compositional asymmetry. CO, gas permeability versus upstream pressure plots are monotonically increasing, suggesting diffusion accompanied by complex plasticization. 0

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