FIELD: chemistry.
SUBSTANCE: additive copolymer 3,3,4-tris(trimethylsilyl)tricyclononene-7 and 3-trimethylsilyltricyclononene-7 of the formula 
(I), where n and m are the proportion of these monomeric units, Me - methyl, the weight-average molecular weight Mw=(3.5-4.5)×105 g/mol, the polydispersity index Mw/Mn=2.5-2.8, the content of 3,3,4-tris (trimethylsilyl) tricyclononene - 7 to 20 mol %. A method of producing the said copolymer and a method for separating gas mixtures using a selectively permeable membrane are also provided, the material of which is said to be an additive copolymer.
EFFECT: increasing the gas permeability of membranes on the basis of the received polymers.
3 cl, 3 dwg, 1 tbl, 2 ex
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