Fragility, stretching parameters and decoupling effect on some supercooled liquids

Abstract The dielectric response of the different binary mixtures of 1,2-propanediol and glycerol have been measured in a spectral range covering nine decades of frequency while the temperature varies from room temperature down to the glass transition temperature T g . The relationship between the fragility, the stretching parameter and the decoupling between the conductivity and the α relaxation times measured by their ratio, τ σ / τ α , has been analysed and compared to the experimental data on m -toluidine.