Prospects for the synthesis and application of copolyimides based on tetracarboxylic acid dianhydride mixturesA. S. Kuleznev, V. A. Zhukova, I. P. Storozhuk, A. N. Zarubina and A. N. IvankinE3S Web of Conf., 413 (2023) 02007DOI: https://doi.org/10.1051/e3sconf/202341302007