FIELD: chemistry.
SUBSTANCE: method of producing membranes involves preparing a solution containing an organic solvent and a unneutralised block-copolymer in a micellar form. At least one amine is added to the solution. The amine is a polyfunctional amine containing two to four nitrogen-containing functionalities, and contains at least two nitrogen-containing functionalities bonded to each other through a linear, branched or cyclic aliphatic bridge fragment. Said solution is then moulded into a membrane containing a sulphonated block-copolymer. Before neutralisation, said sulphonated block-copolymer has at least one terminal block A and at least one inner block B. Each block A essentially does not have any sulphonic acid or sulphonate ester functional groups, and each block B is a polymer block containing from about 10 to about 100 mol % sulphonic acid or sulphonate ester functional groups with respect to the amount of monomer links of block B, which are unneutralised, where each block A contains one or more segments selected from polymerised (i) para-substituted styrene monomers, (ii) ethylene, (iii) alpha-olefins containing 3 to 18 carbon atoms, (iv) 1,3-cyclodiene monomers, (v) monomer conjugated dienes with pre-hydrogenation vinyl content of less than 35 mol %, (vi) acrylic esters, (vii) methacrylic esters and (viii) mixtures thereof. Each block B contains segments of one or more vinyl aromatic monomers selected from polymerised (i) unsubstituted styrene monomers, (ii) ortho-substituted styrene monomers, (iii) meta-substituted styrene monomers, (iv) alpha-methylstyrene, (v) 1,1-diphenylethylene, (vi) 1,2-diphenylethylene and (vii) and mixtures thereof.
EFFECT: obtaining a membrane with improved physical and chemical properties.
24 cl, 3 tbl
