Polyphosphazenes are a class of hybrid inorganic-organic polymer that is being investigated as fuel cell membranes. Polyphosphazenes have an advantage over conventional organic polymers because the inorganic backbone has high thermo-oxidative stability and easily tailored to obtain the desired properties. New synthetic routes have been developed to introduce functional groups, such as sulfonic acid and imidazole, to produce a proton conducting membrane. Our goal is to design and synthesize a superior fuel cell membrane that will optimize proton conduction at high temperatures where conventional fuel cell membranes fail due to dehydration. This is achieved by modifying the side groups and the architecture of the polymer. The conductivity of these membranes will be evaluated at various temperatures and degrees of humidity. Furthermore, morphological characterization of the membranes and evaluation of the state of water will be carried out to provide a complete picture of the proton conduction mechanism in these membranes.