Glassy states: Concentration glasses and temperature glasses compared

Gregory B. McKenna

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


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 languageEnglish
Pages (from-to)3820-3828
Number of pages9
JournalJournal of Non-Crystalline Solids
Issue number41-43
StatePublished - Nov 1 2007


  • Creep
  • Glass transition
  • Polymers and organics
  • Structural relaxation
  • Viscoelasticity
  • Water in glass


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