高含水率ハイドロゲル膜の酸素透過性

概要

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The oxygen permeability of hydrogel membrane was re-examined because diverse values have been reported by many authors. The oxygen permeability coefficient of membranes was measured by Ohashis method using polarographic electrode in liquid-liquid system. The effect of boundary layer was found too large to be neglected in the region of high water content. It is probable that the neglect of the boundary layer effect is the main reason for the diversity of the reported values of oxygen permeability coefficient of hydrogel membrane with high water content. In addition, it was found that the authors preceding report resulted in underestimation of the oxygen permeability because of evaporation of water from hydrogel membrane as the measurement was performed in gas-liquid system though the boundary layer effect was eliminated. The oxygen permeability coefficient of hydrogel membrane obtained in the re-examination is 5.0×10-10ml (STP)cm/(cm2 sec mmHg) at 70% water content and 6.8×10-10 (same unit) at 80% water content. The oxygen permeability coefficient of hydrogel depends on the chemical structure of the polymer in the region of water content below ca. 60%
日本膜学会の論文