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Ionic polymer-metal composites consist in a thin film of electro-activepolymers (Nafion R for example) sandwiched between two metallic electrodes.They can be used as sensors or actuators. The polymer is saturated with water,which causes a complete dissociation and the release of small cations. Thestrip undergoes large bending motions when it is submitted to an orthogonalelectric field and vice versa. We used a continuous medium approach and acoarse grain model; the system is depicted as a deformable porous medium inwhich flows an ionic solution. We write microscale balance laws andthermodynamic relations for each phase, then for the complete material using anaverage technique. Entropy production, then constitutive equations are deduced: a Kelvin-Voigt stress-strain relation, generalized Fourier's and Darcy's lawsand a Nernst-Planck equation. We applied this model to a cantilever E.A.P.strip undergoing a continuous potential difference (static case); a shear forcemay be applied to the free end to prevent its displacement. Applied forces anddeflection are calculated using a beam model in large displacements. Theresults obtained are in good agreement with the experimental data published inthe literature.

Modelling of an Ionic Electroactive Polymer by the Thermodynamics of Linear Irreversible Processes