Abstract
Constitutive equations are derived for the kinetics of physical aging in polymeric glasses. An amorphous polymer is treated as an ensemble of cooperatively rearranging regions (CRR) which relax at random times as they are thermally agitated. Structural recovery is modeled as fragmentation and aggregation of CRRs. To verify the governing equations, results of numerical simulation are compared with experimental data in calorimetric and dynamic tensile tests for three commercial grades of poly(ether imide). Fair agreement is demonstrated between observations and predictions of the model.
Original language | English |
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Pages (from-to) | 1379-1389 |
Number of pages | 11 |
Journal | European Polymer Journal |
Volume | 37 |
Issue number | 7 |
DOIs | |
State | Published - 1 Jul 2001 |
Externally published | Yes |
Keywords
- Aggregation-fragmentation concept
- Amorphous polymers
- Calorimetric tests
- Dynamic tests
- Physical aging
ASJC Scopus subject areas
- General Physics and Astronomy
- Organic Chemistry
- Polymers and Plastics
- Materials Chemistry