Macromolecules, Vol.54, No.5, 2053-2058, 2021
Johari-Goldstein Heterogeneous Dynamics in a Model Polymer
The heterogeneous character of the Johari-Goldstein (JG) relaxation is evidenced by molecular-dynamics simulation of a model polymer system. A double-peaked evolution of dynamic heterogeneity, with maxima located at JG and structural relaxation time scales, is observed and mechanistically explained. The short-time single-particle displacement during JG relaxation weakly correlates with the long-time one observed during structural relaxation.