Study of water content and microheterogeneity of CMS cation exchange membrane

The microheterogeneous model represents an ion-exchange membrane as a multiphase system containing at least two phases, gel phase and electroneutral solution, with volume fractions f1 and f2, respectively, the sum f1 + f2 being equal to 1. The gel phase represents a nanopore medium, globally electroneutral; it includes fixed and mobile ions, polymer matrix, and water. The electroneutral solution, the properties of which are assumed to be the same as these of the outer equilibrium solution, fills the inner parts of meso- and macropores as well as fissures and cavities (=intergel spaces).