Volume Effects on the Glass Transition Dynamics
arXiv:cond-mat/0601388 · doi:10.1016/j.jnoncrysol.2006.02.152
Abstract
The role of jamming (steric constraints) and its relationship to the available volume is addressed by examining the effect that certain modifications of a glass-former have on the ratio of its isochoric and isobaric activation enthalpies. This ratio reflects the relative contribution of volume (density) and temperature (thermal energy) to the temperature-dependence of the relaxation times of liquids and polymers. We find that an increase in the available volume confers a stronger volume-dependence to the relaxation dynamics, a result at odds with free volume interpretations of the glass transition.
9 pages 5 figures
References in corpus (6)
- Fragile-to-strong transition and polyamorphism in the energy landscape of liquid silica
- Thermodynamical Scaling of the Glass Transition Dynamics
- Scaling the alpha-relaxation time of supercooled fragile organic liquids
- Minimal model for beta relaxation in viscous liquids
- Temperature and Density Effects on the Local Segmental and Global Chain Dynamics of Poly(oxybutylene)
- Energy landscape - a key concept for the dynamics of glasses and liquids