Predicting the Density-Scaling Exponent of a Glass-Forming Liquid from Prigogine-Defay Ratio Measurements
Abstract
Understanding the origin of the dramatic temperature and density dependence of the relaxation time of glass-forming liquids is a fundamental challenge in glass science. The recently established "density-scaling" relation quantifies the relative importance of temperature and density for the relaxation time in terms of amaterial-dependent exponent. We showthat this exponent for approximate single-parameter liquids can be calculated from thermoviscoelastic linear-response data at a single state point, for instance an ambient-pressure state point. This prediction is confirmed for the van der Waals liquid tetramethyl-tetraphenyl-trisiloxane. Consistent with this, a compilation of literature data for the Prigogine-Defay ratio shows that van derWaals liquids and polymers are approximate single-parameter systems, whereas associated and network-forming liquids are not.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 2011
- Accession Number
- ADA549977
Entities
People
- Bo Jakobsen
- Daniel Fragiadakis
- Ditte Gundermann
- Nicholas P. Bailey
- Niels B. Olsen
- Riccardo Casalini
- Tage Christensen
- Thomas B. Schroder
- Tina Hecksher
- Ulf R. Pedersen
Organizations
- United States Naval Research Laboratory