Current trends in the synthesis of soluble and hot-melt polyimides A. S. Kuleznev, I. P. Storozhuk, V. A. Zhukova, A. N. Zarubina and A. N. Ivankin E3S Web Conf., 413 (2023) 02033 Published online: 11 August 2023 DOI: 10.1051/e3sconf/202341302033