Effects of aging on poly(1-trimethylsilyl-1-propyne) membranes irradiated with vacuum ultraviolet radiation for gas separation

摘要

In this study, we investigated the effects of physical aging on the surface and gas-transport properties of highly gas permeable poly(1-trimethylsilyl-1-propyne) membranes irradiated with vacuum ultraviolet (VUV) radiation. VUV excimer lamp irradiation was performed on one side of the membrane for 6 or 60 min. The gas permeabilities for carbon dioxide (CO2) and nitrogen (N-2) were determined through a volumetric measurement method at 23 degrees C. The gas permeabilities for CO2 and N-2 increased temporarily at 7 days after 6 and 60 min of VUV irradiation of the membranes. The change in the gas permeability for N-2 was more remarkable than that for CO2. These changes were related to the C-O or SiOx ratio. The C-O ratio was related to the gas permeability of the membranes VUV-irradiated for 6 min, whereas the SiOx ratio was related to the gas permeability of the membranes VUV-irradiated for 60 min. These changes affected the gas selectivities of the membranes. (C) 2017 Wiley Periodicals, Inc.