Аннотация:The polycondensation of norbornane-2,3,5,6-tetracarboxylic acid dianhydride with variousdiamines has been studied for the first time in order to synthesize new polyimides based on cycloaliphaticdianhydride. Norbornane-2,3,5,6-tetracarboxylic dianhydride (NBDA) has been synthesized from cis-5-norbornane-exo-2,3-dicarboxylic anhydride. The possibility of obtaining polyimides based on norbornane-2,3,5,6-tetracarboxylic dianhydride has been studied by carrying out synthesis under different conditions.Chloroform-soluble, film-forming polyimides based on norbornane-2,3,5,6-tetracarboxylic dianhydridehave been obtained by one-step catalytic polycyclocondensation of norbornane-2,3,5,6-tetracarboxylic dianhydridewith aromatic diamines in a benzoic acid melt. According to the second method, the polyimide basedon norbornane-2,3,5,6-tetracarboxylic dianhydride has been produced using a two-step procedure: low-temperaturepolycondensation of silylated cycloaliphatic diamine (N,N′-bis(trimethylsilyl)isophoronediamine)in an amide solvent to form a soluble prepolymer with its subsequent imidization in the solid phase. The heattreatment conditions have been optimized for the prepolymer, allowing the production of a polymer with acomposition corresponding to the target polyimide. The obtained polymers have been characterized by IRspectrometry, 1H NMR and solid-state 13C NMR spectroscopy, elemental analysis, and DSC and TGA techniques.
