fig2

Figure 2. (A) Volumetric expansion of the membrane after the controlled solvent swelling treatment using different solvent concentrations, and digital photos of (B) SPEEK40, (C) SPEEK45, and (D) SPEEK50 membranes.
Figure 2. (A) Volumetric expansion of the membrane after the controlled solvent swelling treatment using different solvent concentrations, and digital photos of (B) SPEEK40, (C) SPEEK45, and (D) SPEEK50 membranes.
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