Permeability coefficients of dissolved carbon dioxide in poly(dimethyl siloxane), plasmatreated poly(dimethyl siloxane) membranes, and other membranes were measured by applying a carbon dioxide electrode in a liquid to liquid diffusion cell. The apparent permeability coefficients of carbon dioxide polystyrene, low density polyethylene, and nylon membranes in a liquid phase were observed to be higher than those in a gas phase due to a plasticizing effect of water molecules in the membranes. Boundary layer's resistance was estimated for plasma-treated and nontreated poly(dimethyl siloxane) membranes. The plasma treatment (10 W for 1 min in this study) which makes hydrophilic surfaces without change of bulk polymer properties was found to be effective to decrease the boundary layer's thickness and to increase the apparent permeability coefficient in the liquid phase.
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