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On the origin of time-aging-time superposition.
1School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, USA.
The Journal of Chemical Physics
|January 8, 2024
Summary
Physical aging exhibits time-aging-time superposition, where relaxation profiles shift uniformly. This study proposes a model reconciling homogeneous aging with heterogeneous structural recovery and relaxation, suggesting a lack of local time constant correlation.
Area of Science:
- Materials Science
- Physical Chemistry
- Condensed Matter Physics
Background:
- Physical aging involves changes in material properties over time.
- Time-aging-time superposition describes a uniform shift in relaxation profiles during aging.
- This contrasts with the heterogeneous nature of structural relaxation in equilibrium.
Purpose of the Study:
- To reconcile the apparent homogeneity of aging with the heterogeneity of structural relaxation.
- To propose a model explaining single-parameter aging phenomena.
- To investigate the correlation of time constants in structural recovery and relaxation.
Main Methods:
- Analysis of experimental data on physical aging.
- Theoretical modeling of structural recovery and relaxation processes.
- Examination of susceptibility spectrum and decay function characteristics.
Main Results:
- Experimental verification of time-aging-time superposition and single-parameter aging.
- Proposed model where aging and relaxation are heterogeneous but lack local time constant correlation.
- Demonstrated consistency between the model and observed aging phenomena.
Conclusions:
- The proposed model successfully explains how homogeneous aging can arise from heterogeneous processes.
- Structural recovery and relaxation share a similar time constant dispersion, despite local heterogeneity.
- This framework provides a unified understanding of aging dynamics in disordered materials.
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