Abstract
The behavior of glass-forming systems in the equilibrium state above the glass temperature is still a heavily investigated field. Surprisingly, the behavior of the glass itself is less widely investigated. Even less investigated is the behavior of glass-forming materials in which composition is changed. Here we look at the behavior of glasses after temperature-jumps and compare that behavior with that of glasses subjected to concentration-jumps. Moisture and carbon dioxide are used as the plasticizing environments. Surprisingly, the glass created by jumping (down) to a given final condition via a change in concentration is more stable than that formed by a change in temperature - this in spite of the external condition of temperature and chemical activity (RH or carbon dioxide pressure) being the same. Furthermore, the concentration glass under such conditions has a higher excess volume than the temperature glass and its response does not 'merge' with that of the temperature glass, hence, the concentration glass is not the same as a temperature hyperquenched glass.
Original language | English |
---|---|
Pages (from-to) | 3820-3828 |
Number of pages | 9 |
Journal | Journal of Non-Crystalline Solids |
Volume | 353 |
Issue number | 41-43 |
DOIs | |
State | Published - Nov 1 2007 |
Keywords
- Creep
- Glass transition
- Polymers and organics
- Structural relaxation
- Viscoelasticity
- Water in glass