TY - JOUR
T1 - A comparison of concentration-glasses and temperature-hyperquenched glasses
T2 - CO2-formed glass versus temperature-formed glass
AU - Alcoutlabi, Mataz
AU - Banda, Lameck
AU - McKenna, Gregory B.
N1 - Funding Information:
We would like to thank the National Science Foundation for supporting this work under grant numbers DMR-0070052 and DMR-0307084. We would like to thank Mr Kim Zinsmeyer, in the Department of Physics at Texas Tech University, for his help in making some of the components of the pressure apparatus used in this work.
PY - 2004/7/21
Y1 - 2004/7/21
N2 - 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.
AB - 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.
KW - Glass transition
KW - Hyperquenched glass
KW - Structural relaxation
UR - http://www.scopus.com/inward/record.url?scp=4143138614&partnerID=8YFLogxK
U2 - 10.1016/j.polymer.2004.04.004
DO - 10.1016/j.polymer.2004.04.004
M3 - Article
AN - SCOPUS:4143138614
SN - 0032-3861
VL - 45
SP - 5629
EP - 5634
JO - Polymer
JF - Polymer
IS - 16
ER -