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

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タイトル別名
  • Gas Permeability of Porous Polycarbonate Membrane
  • 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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抄録

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.

収録刊行物

  • 高分子論文集

    高分子論文集 34 (10), 729-736, 1977

    公益社団法人 高分子学会

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