| 摘要 |
The invention concerns a semi-permeable membrane film, selectively permeable to water vapour from a solvent in the presence of the corresponding liquid, wherein the membrane layer, advantageously adherent to a support layer enhancing mechanical strength, consists of a polymer material formed of copolymerised rigid and flexible sequences, said flexible sequences being based on an oligomer with affinity for said solvent and in sufficient proportion relative to said rigid sequences to ensure through its vacant sites the migration of the solvent molecules through said layer under the effect of a difference in osmotic pressure between its two surfaces. |
