Functional dynamic polymers, "dynamers", are used to design new membrane materials. Our efforts involve the synthesis and the fabrication of dynamic thin-layer supported solid membrane films. The transport performances of (permeability, selectivity and partition coefficients) are evaluated by using the solution-diffusion model. The membrane performances designed to transport ionic salts NaCl and KCl depend and are based on encoded molecular features of the monomeric subcomponents. Thanks to the possibility to combine the structural and functional features of different monomers, the heteropolymeric membrane materials can exhibit very different properties from their original homopolymeric components. In the examples developed here, this strategy revealed itself as a versatile way for the synthesis of new membranes presenting different permeabilities and preserving their selectivity (SK+/Na+ similar to 1.4). (C) 2008 Elsevier B.V. All rights reserved.