Glass Transitions of Molecular Materials Studied by Calorimetry

Focused on High Pressure Experiments

Abstract

Our recent calorimetric studies on glass transition, especially for high pressure experiments, are reviewed in this article. The materials examined are molecular liquids with relatively simple molecular structure. The content of the article is as follows. (1) Introduction (2) Adiabatic Calorimeter under High Pressure (3) Configurational Entropy and Short-Range Ordering (4) Configurational Entropy and α Relaxation Time (5) Pressure Dependence of Glass Transition and Adam-Gibbs Theory. (6) Prigogine-Defay Ratio and Internal Parameter Theory (7) Structural Relaxation in (Volume) - (Internal Energy) - (Gibbs Energy) Space (8) Concluding Remarks