Abstract
The chemical durability of blends based on pyromellitic dianhydride–oxydianiline (PMDA–ODA) and benzophenone tetracarboxylic dianhydride–oxydianiline (BTDA–ODA) polyimides with nylon 6 is described. The stabilities of the blend films in conc. H 2SO 4 and in 40% aqueous NaOH are equivalent to that of the control film and slightly better than commercially available Kapton™ film, but the stability of the PMDA based blend films in dilute NaOH (1.5%) is better compared to the control film. The weight gains of the films in solvents like dichloromethane, methyl ethyl ketone and water are dependent on the nature of the solvent and its interaction with the blend, but the BTDA based blend films show overall better chemical resistance.
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