Gas permeation through glassy polymer membranes with relatively low glass-transition temperature |
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Authors: | Seong-Youl Bae Du-Hyon Cho Sang-Wook Ko Hee-Taik Kim Hidehiro Kumazawa |
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Affiliation: | (1) Department of Chemical Engineering, Hanyang University, 133–791 Seoul, Korea;(2) Department of Chemical Engineering, Kyoto University, Kyoto, Japan |
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Abstract: | When the glass-transition temperature of the polymer is not so much higher than the experimental temperature, the pressure
dependence of the mean permeability coefficient of the poly-mer membrane to a gas is apt to deviate from the prediction by
the conventional dual-mode mobility model, and to obey a similar model with concentration-dependent diffusivities because
of the plasticization action of sorbed gas in the polymer membrane. In this work, sorption and permeation for oxygen and carbon
dioxide in a membrane of polystyrene whose glass-transition temperature is 95°C, were measured to discuss the mechanism of
gas diffusion in glassy polymer membranes with relatively low glass-transition temperature at 30, 40 and 50°C respectively. |
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