The role of temperature and density on the glass-transition dynamics of glass formers

摘要

A correlation between the monomeric volume and the dynamic quantity E-V(*)/H-*, used to provide a quantitative measure of the role of temperature and density on the dynamics, is demonstrated for a series of polymers and glass-forming liquids. We show that monomeric volume and local packing play a key role in controlling the value of this ratio and thus the dynamics associated with the glass temperature.