▎ 摘　　要

Dynamic mechanical spectroscopy is used to investigate the variation of the glass rubbery transition temperature (T-g) of graphene/polyimide nanocomposites. The T-g was obtained as the temperature corresponding to the peak of the tan delta versus temperature curve for the alpha transition. Cole-Cole curve was constructed for the matrix and the composites composite at 1 Hz and a hemispherical curve was obtained suggesting that the constituents have similar relaxation behavior. The time-temperature superposition principle was used tomodel the behavior of the nanocomposites at lower frequencies and longer times. Frequency sweep was performed in the range of 0.05-100 Hz at different temperatures. The storage modulus curves obtained at different temperatures (isothermal), as a function of frequency, were shifted horizontally to construct a continuous master curve. Both the generalized reduced gradient method and the Williams-Landel-Ferry (WLF) equation were used to calculate the activation energy for glass-rubber transition. The universal constants C-1 and C-2 were determined using the WLF equation. The dependence of relaxation time on temperature was verified.