LAUSR

Graphene oxide (GO) and its reduced version (RGO) were prepared and functionalized with phenyl glycidol chlorophosphate (PGC) to obtain the corresponding GO-PGC and RGO-PGC materials. These graphene systems were used to prepare thermosetting composites with a tetrafunctional epoxy resin, 4,4′-methylenebis(N,N-diglycidylaniline) (TGMDA) cured with 4,4′-diamino-diphenyl-sulfone (DDS). The systems were evaluated by dynamic mechanical analysis at constant strain and temperature sweeps to estimate the viscoelastic properties and relaxation phenomena at long time, which is important for modeling the mechanical long-term behavior. The time temperature superposition (TTS) principle was employed for the construction of a master curve. The addition of the graphene-type fillers shifted the time when the relaxation phenomena start to occur towards higher values, suggesting a better working temperature and durability of the corresponding nanocomposites when compared to the neat epoxy network. This phenomenon is more pronounced for the systems prepared with functionalized graphenes. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 133, 44816.