Effects of plasma treatment on CO2 plasticization of poly(methyl methacrylate) gas-separation membranes

Authors

  • Chien-Chieh Hu,

    1. R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan University, Chung Li 32023, Taiwan, Republic of China
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  • Chen-Yuan Tu,

    1. R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan University, Chung Li 32023, Taiwan, Republic of China
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  • Yi-Chieh Wang,

    1. Department of Chemical Engineering, Nanya Institute of Technology, Chung Li 32034, Taiwan, Republic of China
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  • Chi-Lan Li,

    1. Department of Chemical Engineering, Nanya Institute of Technology, Chung Li 32034, Taiwan, Republic of China
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  • Kueir-Rarn Lee,

    Corresponding author
    1. Department of Chemical Engineering, Nanya Institute of Technology, Chung Li 32034, Taiwan, Republic of China
    • Department of Chemical Engineering, Nanya Institute of Technology, Chung Li 32034, Taiwan, Republic of China
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  • Juin-Yih Lai

    1. R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan University, Chung Li 32023, Taiwan, Republic of China
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Abstract

To suppress undesirable plasticization effects of condensable gas (CO2) in high pressure gas-separation process, a surface-modified poly(methyl methacrylate) (PMMA) membrane prepared by a plasma treatment was synthesized in this study. The pressure dependencies of permeability were analyzed to characterize the plasticization phenomenon and how it can be controlled by the plasma modification. FTIR-ATR and TGA results suggest that the plasma treatment leads to surface crosslinking of PMMA membrane. Thus, the plasticization effect resulting from sorbed CO2 on the Ar-plasma–treated PMMA membrane was significantly reduced, but the reduction in permeability was lower than that of other crosslinking modification methods. The reduction of the CO2 permeability contributes to a major part to the selectivity of He/CO2 for the Ar-plasma–treated PMMA membranes. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 395–401, 2004

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