Ions tend to aggregate in media of low dielectric constant, and this tendency to form strong associations causes small amounts of ionic functionality to have a significant influence on the properties of ionic polymers. As a consequence of ionic functionality and strong interactions ionomers exhibit unique transport characteristics compared to conventional polymers. While it has been observed that ion mobility is related to viscosity, a comprehensive theory like the existing theories for non-associating systems has not been developed for associating systems. In this study, we developed a modified free-volume approach to describe ion-diffusion and conduction is associating systems.