Temperature effects on gas permselection properties in hexafluoro aromatic polyimides

摘要: Abstract Temperature dependencies of gas permeabilities, solubilities, diffusivities, and selectivities for various pairs (He/CH 4 , CO 2 /CH O /N N ) are reported two hexafluoro-substituted aromatic polyimides prepared in our laboratory. The activation energies permeation diffusion, the heats sorption also reported. These have exceptionally high permeabilities permselectivities as compared to typical glassy polymers used separation membrane applications. temperature dependency all penetrants these is smaller than other standard having more flexible backbones. differences between larger packing-disrupted rigid matrices, however, extreme polymers, thereby causing a stronger permselectivity backbone polymers.