FIELD: chemistry of polymers. SUBSTANCE: reaction medium has, wt.-% water 10-30; acetic or propionic acid 10-15, and dioxane or tetrahydrofuran as a solvent 55-80. Proposed reaction medium can be used repeatedly for one-stage synthesis of polyimides on the basis tricyclodecentetracarboxylic acid dianhydride and 4,4′-diaminodiphenyloxide. Molecular mass of synthesized polyimides is 200000-220000, imidization degree is 93-98% strength and rupture elongation are 125-140 MPa and 12-25% respectively. EFFECT: repeated use of medium without treatment and regeneration. 4 tbl
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