The component dynamics of miscible binary mixtures of glass-formers: new features

International audienceOpposite effects on the width of the dispersion of the α-relaxation and the separation in time scale of the Johari-Goldstein β-relaxation from the α-relaxation are predicted for guest molecules dissolved in a host depending on the glass transition temperature of the host is higher or lower than that of the guest. These predictions are tested by dielectric relaxation measurements on mixtures of two glass-forming mixtures. The results are in agreement with the predictions