The nature of the gamma dielectric relaxation in diglycidyl ether Bisphenol-A (DGEBA) based epoxies

A γ relaxation dielectric loss peak has been measured in the temperature range 113–163 K for a series of epoxy resins based on diglycidyl ether bisphenol-A (DGEBA). The network architecture examined systems were systematically altered using varied types functional modifiers featuring different groups. Analysis dependence frequency leads to radically new interpretation fundamental processes that are associated with relaxation. analysis shown process can best be described terms thermally assisted tunnelling displacement proton, termed activated tunnelling. parameters derived not only fit experimental data well, but have clear physical origin is consistent topology as expressed through glass transition temperature. maximum which such behavior observable determined and measurements. approach proposed here provides method understanding relaxations these similar systems.