Heterogeneous coupled dissipation modeling of volume and enthalpy recovery in glass systems

Abstract

PACS 64.70.Pf, 65.60.+a The dynamics of volume and enthalpy recovery of glasses are studied by introducing a new fictive temperature form and the size distribution of the solid-like clusters into the original heterogeneous coupled dissipation model. The renewed model gives a satisfactory description of the pertinent experiments. The present model is also compared with the successful Kovacs -Aklonis -Hutchinson -Ramos and the ToolNarayanaswamy -Moynihan models. It is found that the parameters describing the non-linearity and nonexponentiality of the recovery in these two models are related with the heterogeneity of glass-formers.