Gas separations asymmetric

Surface tension data was collected for a number of solvent-nonsolvent additive systems related to PPO gas separation asymmetric membranes. These membranes were made from different types of nonsolvent additives and were characterised from gas permeation experiments. The results of pure gas permeance ratios for O2/N2 and CO2/CH4 are shown in Figures 44 and 45. 

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