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GAS PERMEATION THROUGH GLASSY POLYMER MEMBRANES WITH RELATIVELY LOW GLASS-TRANSITION TEMPERATURE

Bae SY Cho DH Ko SW Kim HT Kumazawa H

Korean Journal of Chemical Engineering, January 1993, 10(1), 44-48(5), 10.1007/BF02697376

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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 polymer 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 temperatures is 95℃, were measured to discuss the mechanism of gas diffusion in glassy polymer membranes with relatively low glass-transition temperature at 30,40 and 50 ℃ respectively.

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References

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