polymer for membrane separation technology

hi everyone.
may i solicit from you some good ideas or concept perhaps about synthesis or preperation of polymer for membrane separation.
thank you!
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Ric-Ric wrote:

Separation of what from what? Fresh water from salt water? Methane from crude oil? U-235 from U-238?
Any other criteria? Are poisonous materials or materials that undergo explosive decomposition in contact with air acceptable? Are $2000/kg materials acceptable? Are fatty acids of cetacean origin acceptable?
Are there any mechanical constraints? If the membrane fell apart under 0.001 psi pressure, is that okay?
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