Synthesis and properties of new transparent (co)polyimides based on adamantane-containing diamines and aromatic tetracarboxylic dianhydrides

New (co)polyimides possessing good thermal and physicomechanical characteristics, high hydrolytic stability, and transparency at the best world level were synthesized. It was shown that, depending on the natures of diamine and dianhydride used in the synthesis, the optical properties of polymers also change. These properties of (co)polyimide films correlate with the Δ E value, which is defined as the difference between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) energies of the polyimide repeating unit. It was shown that the use of 1,2-dichlorobenzene makes it possible to obtain high-molecular-weight (co)polyimides with a set of enhanced performance characteristics.