Production of polyimide nonwoven fabric with low dielectric permittivity

This work is devoted to the production of nonwoven polyimide material by electroforming from aqueous solutions of polyamide acid salts based on pyromellitic dianhydride (PMDA) and 4,4′-oxydiphenylenediamine (ODA). The dielectric and mechanical properties of the nonwoven material were determined over a wide frequency and temperature range. The dielectric permittivity of the material at 20 °C and a frequency of 1 Hz was 1.5.