The structural (α-) relaxation in diglycidylether of bisphenol A (DGEBA) has been examined using three spectroscopic methods: dielectric spectroscopy (DS), dynamic light scattering–photon correlation spectroscopy (LS), and mechanical spectroscopy. The DS and LS measurements were carried out as a function of both temperature and pressure. Moreover, pressure-volumetemperature measurements were obtained for the DGEBA. These data allow an assessment of the relative contributions of thermal energy and free volume to structural relaxation in DGEBA. The results clearly show a substantial role for both thermal and free volume fluctuations in the dramatic slowing down of the dynamics. The combined temperature- and pressure-dependences of the dielectric and light scattering relaxation times were analyzed using the Avramov equation, implying that the fragility (normalized temperature dependence) is pressure independent over the studied range of pressures. The pressure dependence was the same as measured by the different spectroscopies. Conformance to the time-temperature-pressure superposition principle was also observed for all measurement techniques.
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15 February 2003
Research Article|
February 15 2003
Pressure and temperature dependence of structural relaxation in diglycidylether of bisphenol A
M. Paluch;
M. Paluch
Naval Research Laboratory, Chemistry Division, Code 6120, Washington, D.C. 20375-5342
Institute of Physics, Silesian University, Uniwersytecka 4, 40-007 Katowice, Poland
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C. M. Roland;
C. M. Roland
Naval Research Laboratory, Chemistry Division, Code 6120, Washington, D.C. 20375-5342
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J. Gapinski;
J. Gapinski
Institute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznan, Poland
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A. Patkowski
A. Patkowski
Institute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznan, Poland
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J. Chem. Phys. 118, 3177–3186 (2003)
Article history
Received:
June 20 2002
Accepted:
November 22 2002
Citation
M. Paluch, C. M. Roland, J. Gapinski, A. Patkowski; Pressure and temperature dependence of structural relaxation in diglycidylether of bisphenol A. J. Chem. Phys. 15 February 2003; 118 (7): 3177–3186. https://doi.org/10.1063/1.1538597
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