Abstract
The structure variation of cellulose acetate (CA) reverse osmosis (RO) membranes due to thermal annealing was investigated by using gas adsorption. When the CA membranes were dehydrated by freeze-drying, the morphology of the unannealed membrane was similar to that of the annealed membrane. On the contrary, with air-drying which induced structure collapse of the CA membranes, gas adsorption behavior of the unannealed membrane showed a significant difference from that of the annealed membrane. The CA RO membrane in an unannealed state totally collapsed during air-drying, but the membrane that was annealed for 10 min at 90°C showed significantly reduced collapsing compared to the unannealed one. However, even though the CA membranes were annealed, use of methanol as the wetting agent caused complete collapsing during air-drying.
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