多孔性高分子膜の透過性　ＩＩ　　ポリカーボネート多孔膜の気体透過性に及ぼす膜の平均孔径の影響

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タイトル別名
  • Change of Gas Permeability of Polycarbonate Porous Membrane with Its Average Pore Size
  • ポリカーボネート タコウ マク ノ キタイ トウカセイ ニ オヨボス マク ノ

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The detailed examination was carried out about the influence of average pore size of polymeric membrane on gas permeability coefficient P (P1, P2), where P1 and P2 are pressures at both sides of the membrane (P1≥P2). Three polycarbonate porous membranes having straight through cylindrical pores were employed for this purpose. Their 4th-average pore sizes (r4) measured by electron microscope were 0.325, 0.183 and 0.0984 μm. (1) P1- and P2-dependence of P (P1, P2) can be interpreted by the two physically different processes; free molecular flow and viscous flow including slip flow, if the pore size distribution N (r) of the membrane is taken into consideration, (2) with the decrease in r4, the relative contribution of free molecular flow to P (P1, P2) increases, (3) P (P1, P2) depends on P1 and P2individually, (4) P (P1, P2) is much larger than P (P1, 0) which is defined as the value of P (P1, P2) extrapolated to P2=0. These results are well explained by the theoretical equation proposed in the preceding paper. In the region where r4 is smaller than the mean free path of gas, P (P1, 0) of oxygen is larger than that of carbon dioxide, although the difference of P (P1, 0) between these gases depends on r4 and P1. The effective separation of the mixed gas of helium and nitrogen into its component gases can be performed by using the porous membrane of r4 of 0.0984 μm.

収録刊行物

  • 高分子論文集

    高分子論文集 34 (10), 737-745, 1977

    公益社団法人 高分子学会

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