Effects of aging on poly(1‐trimethylsilyl‐1‐propyne) membranes irradiated with vacuum ultraviolet radiation for gas separation |
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| Authors: | Tetsuro Yoshioka Yoshiki Miyashita Taichi Motoo Kentaro Saito Kazukiyo Nagai |
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| Affiliation: | Department of Applied Chemistry, Meiji University, 1‐1‐1 Higashi‐Mita, Tama‐Ku, Kawasaki, Japan |
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| Abstract: | 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 (N2) were determined through a volumetric measurement method at 23 °C. The gas permeabilities for CO2 and N2 increased temporarily at 7 days after 6 and 60 min of VUV irradiation of the membranes. The change in the gas permeability for N2 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. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 45973. |
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| Keywords: | aging membranes photochemistry separation techniques structure– property relations |
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