Johari-Goldstein heterogeneous dynamics in a model polymer
arXiv:2102.12527 · doi:10.1021/acs.macromol.1c00066
Abstract
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 (DH), 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}.
References in corpus (5)
- Theoretical perspective on the glass transition and amorphous materials
- Fractal free energy landscapes in structural glasses
- Non-gaussian effects in the cage dynamics of polymers
- Role of structure in the alpha and beta dynamics of a simple glass-forming liquid
- Fast Vibrational Modes and Slow Heterogeneous Dynamics in Polymers and Viscous Liquids