| 摘要 |
A semi-permeable membrane which comprises either (i) a copolymer of acrylonitrile and at least one ionic or ionizable monomer, or (ii) a copolymer of acrylonitrile, at least one ionic or ionizable monomer, and at least one non-ionic and non-ionizable monomer, or (iii) a mixture of at least two copolymers as defined under (i) and/or (ii), or (iv) a mixture of at least one copolymer as defined under (i) and/or (ii), and at least one copolymer of acrylonitrile and at least one non-ionic and non-ionizable monomer, the ionic or ionizable monomer units representing from 1 to 80 mole % of the monomer units in one of said copolymers, and representing from 1 to 50 mole % of the monomer units in the membrane, said membrane having a degree of salt rejection of less than 1% and a permeability to water of more than 100 liters/day.m2 at a relative pressure of 2 bars is provided having excellent properties for use in ultrafiltration and dialysis. A process for preparing a semi-permeable membrane is also provided which comprises treating a film containing at least one copolymer of acrylonitrile and an ionic or ionizable monomer, with water or an aqueous non-solvent mixture at a temperature between 60 DEG and 250 DEG C. |
