A comparison of concentration-glasses and temperature-hyperquenched glasses: CO2-formed glass versus temperature-formed glass

Mataz Alcoutlabi, Lameck Banda, Gregory B. McKenna

Research output: Contribution to journalArticle

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Abstract

Prior work from this laboratory has reported anomalous differences in the viscoelastic responses between temperature-jump formed glasses and carbon dioxide pressure-jump or relative humidity formed glasses. In the present work, we investigate the anomalous behaviour further by examining the structural response of an epoxy resin after pre-annealing treatments. In particular, we have measured the volume change of amine-cured diglycidyl ether of bisphenol A after thermal and carbon dioxide pressure (PCO2) treatments. Our results show that contrary to prior interpretations in the literature, a plasticizer quench is different from a temperature hyperquench. Consistent with our prior work, the CO2-formed glass is more stable than the temperature-formed glass in spite of the former having a higher excess volume. Our new results show that the stability persists to above the nominal glass temperature, contrary to what happens in a temperature hyperquench.

Original languageEnglish
Pages (from-to)5629-5634
Number of pages6
JournalPolymer
Volume45
Issue number16
DOIs
StatePublished - Jul 21 2004

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Keywords

  • Glass transition
  • Hyperquenched glass
  • Structural relaxation

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