An equation for the description of volume and temperature dependences of the dynamics of supercooled liquids and polymer melts

Abstract

A recently proposed expression to describe the temperature and volume dependences of the structural (or alpha) relaxation time is discussed. This equation satisfies the scaling law for the relaxation times, tau = f(TV^g), where T is temperature, V the specific volume, and g a material-dependent constant. The expression for the function f is shown to accurately fit experimental data for several glass-forming liquids and polymers over an extended range encompassing the dynamic crossover, providing a description of the dynamics with a minimal number of parameters. The results herein can be reconciled with previously found correlations of the isochoric fragility with both the isobaric fragility at atmospheric pressure and the scaling exponent g.

to be published in the special edition of J. Non-Crystalline Solids honoring K.L. Ngai

References in corpus (3)

• Thermodynamic Scaling of the Viscosity of Van Der Waals, H-Bonded, and Ionic Liquids
• Thermodynamic interpretation of the scaling of the dynamics of supercooled liquids
• Effect of entropy on the dynamics of supercooled liquids: New results from high pressure data

Cited by in corpus (7)

• Thermodynamic scaling of diffusion in supercooled Lennard-Jones liquids
• Polymer Glass Formation: Role of Activation Free Energy, Configurational Entropy, and Collective Motion
• Equation of State and Entropy Theory Approach to Thermodynamic Scaling in Polymeric Glass-Forming Liquids
• Thermodynamic scaling of vibrational dynamics and relaxation
• Activation Volume in the Density Scaling Regime: Equation of State and Its Test by Using Experimental and Simulation Data
• Role of entropy in the thermodynamic evolution of the time scale of molecular dynamics near the glass transition
• The origin of the density scaling exponent for polyatomic molecules and the estimation of its value from the liquid structure