FIELD: cosmic and rocket engineering. SUBSTANCE: diamine-5-amino-2-(p-aminophenyl)-benzimidazole is mixed with pyromellitic acid dianhydride. Prepared mixture is added to the solvent - N,N,N′-dimethylacetamide for 20-30 min. Firstly, 2/3 mixture of total mass mixture is added for 5-7 min, and then - by equal portions at 5 min intervals. Also, 4,1-diaminodiphenyl ester (15-85% of diamine mass) can be added. EFFECT: improved method of solution preparing. 2 cl
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