The blend behavior of polybenzimidazole and a series of polyaramides with polyvinylpyrrolidone is presented. Regardless of their chemical structure, all systems showed miscible blends over the composition range investigated. This may offer the opportunity to extend the application range of these basically structural materials into the area of functional polymers. Especially in membranes, the addition of the highly hydrophilic polyvinylpyrrolidone leads to a considerable increase in performance, i.e., in flux and antifouling behavior.