Gas Permeability of Porous Polycarbonate Membrane

DOI Web Site 2 Citations
  • NOHMI Takashi
    Department of Polymer Technology, Tokyo Institute of Technology
  • MANABE Sei-ichi
    Textile Research Laboratory, Asahi Chemical Industry Co., Ltd.
  • KAMIDE Kenji
    Textile Research Laboratory, Asahi Chemical Industry Co., Ltd.
  • KAWAI Toru
    Department of Polymer Technology, Tokyo Institute of Technology

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Other Title
  • 多孔性高分子膜の透過性　Ｉ　　ポリカーボネート多孔膜の気体透過性
  • ポリカーボネート タコウ マク ノ キタイ トウカセイ タコウセイ コウブンシ

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Abstract

Gas permeability of cylindrically straight porous polycarbonate membrane having 4th-average pore size (r4) of 0.567μm was studied for several mono--tri-atomic molecule gases in the pressure range of 0-320cmHg. Equation of gas permeability coefficient P (P1, P2) relating to the pore size distribution of the membrane N (r) was derived on the assumption that the passage of gas through a straight porous membrane involves four physical processes such as viscous flow including slip flow, free molecular flow, surface diffusion, and diffusion. If Maxwell's reflection coefficient is known beforehand and when N (r) is determined experimentally, P (P1, P2) can be calculated by using this equation from the mean free path of gas. In the case when r4, is larger than a tenth of mean free path of the gas molecule, the molecules permeate through the membrane by the mechanism of viscous flow. P (P1, P2) depends not only on the mean pressure at both sides of the membrane (P1+P2) /2, but also on P1 and P2 individually. P (P1, P2) increases with P1 and P2. This can be interpreted by an increase in the amount of the permeated gas molecules due to viscous flow and a decrease of Maxwell's reflection coefficient.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 34 (10), 729-736, 1977

    The Society of Polymer Science, Japan

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