FIELD: chemistry of polymers. SUBSTANCE: described is method of preparing chemical compound, namely diamine consisting of aromatic and cycloaliphatic fragments, more specifically disodium salt of N,N-bis-(4-amino-2-sulfophenyl) piperazine which is used as monomer in preparing high-strength, heat resistant and cation-exchange materials. EFFECT: longer ion-exchange process without reducing polymer properties such as heat resistance, and chemo resistance or the like. 3 ex
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RU2074182C1 |
