FIELD: chemistry.
SUBSTANCE: invention describes a sulphonated block copolyemer which is solid in water, insoluble in water and has a general configuration A-D-B-D-A, (A-D-B)nX, A-B-A, (A-B)nX, or mixtures thereof, where n is an integer from 2 to approximately 30, and X is a residue of a cross-linking agent, where: a) each block A and each block D is a polymer block resistant to sulphonation, and each block B is a polymer block susceptible to sulphonation, wherein said blocks A, B and D do not contain significant levels of olefinic unsaturation; b) each block A independently has number-average molecular weight of 1000-60000, and each block B independently has number-average molecular weight of 10000-300000; wherein c) each block A contains one or more segments selected from polymerised para-substituted styrene monomers or 1,3-butadiene, where segments containing polymerised conjugated dienes, containing less than 35 mol % vinyl before hydrogenation, are then hydrogenated; d) each block B contains segments of polymerised monomers of unsubstituted styrene, mixtures of unsubstituted styrene/hydrogenated 1,3-butadiene, mixtures of unsubstituted styrene/alpha-methylstyrene, or 1,1-diphenylethylene; e) each block D contains polymers having glass transition point lower than 20°C and number-average molecular weight of 1000-50000, where the said block D is selected from a group consisting of polymerised isoprene, 1,3-butadiene and mixtures thereof, having vinyl content of 20-80 mol % before hydrogenation, where the said segments containing polymerised 1,3-butadiene or isoprene are then hydrogenated; f) said blocks B are sulphonated in the range 10-100 mol % in terms of vinyl aromatic monomer links in the said blocks B; and g) molar percentage of vinyl aromatic monomers which are unsubstituted styrene monomers, 1,1-diphenylethylene, alpha-methylstyrene, each block B is between 10 mol % and 100 mol %. The invention also describes an article made at least partially from a composition containing said sulphonated block copolymer; a method of modifying transport properties of a film made from said polymer; a composition containing said sulphonated block copolymer.
EFFECT: obtained sulphonated block copolymers exhibit balance of properties, including water transfer, strength in wet state, stability of dimensions and manufacturability, previously unachievable.
30 cl, 4 dwg, 8 tbl, 16 ex
