Reorientational relaxation times for five molecular liquids and local segmental relaxation times for two polymers plotted versus the scaling variable (Eq. (4)). For glycerol the data are limited to T < 290 K due to the large change in behavior at higher temperatures (see text). The solid lines are the best fits of Eq. (6). The quantity plotted is ρ 1/3 T 1/2 times the measured relaxation time (see Ref. 26).
Representative double logarithmic plots of temperature versus inverse density at constant reduced τ for two materials. The lines represent power law fits (Eq. (5)), with the variation in slope shown in the inset. The average scaling exponents, γ avr , are listed in Table I for each material. For glycerol there is a change in behavior for T > 290 K, which corresponds to pressures exceeding 1.8 GPa.
(Left) Pearson goodness of fit parameters for Eq. (6) and (right) standard deviation of the power-law exponents (Eq. (5)) divided by the average value versus the inverse square root of the Prigogine–Defay ratio. All data are for atmospheric pressure, except PDE for which P = 120 MPa.
Ratio of isochoric activation energy and isobaric activation enthalpy versus the inverse square root of the Prigogine–Defay ratio. Higher values of the ordinate correspond to more temperature-driven dynamics.
Scaling exponents and their variation and the Prigogine–Defay ratio.
Activation energy ratio comparison.
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