Gas transport properties of asymmetric polyimide membranes prepared by plasma‐based ion implantation |
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| Authors: | Teppei Tezuka Tomohiro Kobayashi Daigo Muraoka Shoji Nagaoka Yoshiaki Suzuki Hiroyoshi Kawakami |
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| Institution: | 1. Department of Applied Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo 192‐0397, Japan;2. The Institute of Physical and Chemical Research, 2‐1 Hirosawa, Wako, Saitama 351‐0198, Japan |
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| Abstract: | In this study, we report the gas permeance and selectivity of the asymmetric polyimide membrane prepared by plasma‐based ion implantation (PBII). The asymmetric polyimide membranes were prepared using a dry–wet phase inversion process, and the surface skin layer on the membrane was implantated by He ions at 2.5 keV. The asymmetric membranes treated by PBII were measured using a high vacuum apparatus with a Baratron absolute pressure gauge at 76 cmHg and 35°C. The (O2/N2) and (CO2/CH4) selectivities in the He+‐implanted asymmetric membrane at 60 sec resulted in 1.5 and 1.8 time increases, respectively, when compared to those of the asymmetric membrane before PBII. On the other hand, the O2 and CO2 permeances in the asymmetric membrane after PBII decreased with an increase in the He+ treatment time. In this paper, we addressed, for the first time, the gas permeation behavior of the asymmetric polyimide membranes prepared by PBII. Copyright © 2009 John Wiley & Sons, Ltd. |
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| Keywords: | plasma‐based ion implantation asymmetric polyimide membrane dry– wet phase inversion process gas permeance gas selectivity |
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