ピストンを用いた容積型透過性測定装置による膜内気体拡散係数の評価〔英文〕

概要

論文の詳細を見る
The applicability of the newly developed permeability apparatus of the piston-feeder type to the evaluation of the gas diffusion coefficients in membrane were examined using silicone rubber/O<SUB>2</SUB> and/N<SUB>2</SUB> systems at 15°C. The data for the gas diffusivity were obtained by the time lag method and these values were in good agreement with those obtained by the apparatus of the high-vacuum type. Such results were demonstrated for the first time in the case of the volumetric method and suggest that the newly developed permeability apparatus is sufficiently applicable to the evaluations of the diffusivity as well as the permeability, if only the pre-experimental conditions can be set up properly. Meanwhile, it was also actually observed that time lag is much affected with the initial deviation of the gas distribution between the inside and the outside of membrane. This phenomenon is always liable to occur in the case of the volumetric method and the experimental results could be well-described by the Fickian desorption mechanism in the case that the gas concentration in membrane is higher than the equilibrium concentration defined by the outside pressure. From this consideration, the criteria of the initial set-up conditions for the valid evaluations in the repeated measurements were discussed.
日本膜学会の論文