A Model for the Diffusion of Moisture in Adhesive Joints. Part I: Equations Governing Diffusion
| Autor: | Thomas C. Ward, Didier R. Lefebvre, David A. Dillard |
|---|---|
| Rok vydání: | 1989 |
| Předmět: |
chemistry.chemical_classification
Molecular diffusion Materials science Constitutive equation Kinetics Thermodynamics Surfaces and Interfaces General Chemistry Polymer Surfaces Coatings and Films Penetrant (mechanical electrical or structural) chemistry Mechanics of Materials Materials Chemistry medicine Adhesive Composite material Solubility Swelling medicine.symptom |
| Zdroj: | The Journal of Adhesion. 27:1-18 |
| ISSN: | 1545-5823 0021-8464 |
| Popis: | A methodology is proposed to relate the diffusion coefficient of small penetrant molecules in polymers to temperature, strain, and penetrant concentration. The approach used is based on well-known free volume theories. It is assumed that the transport kinetics is governed by the constant redistribution of the free volume, caused by the segmental motions of the polymeric chains. An expression for the diffusion coefficient is inferred from the temperature, strain, and penetrant concentration dependence of the free volume. The stress dependence of solubility is predicted from the Hildebrand theory. It is shown that the resulting constitutive equations exhibit many features desirable for joint durability studies. Finally, a non-Fickian driving force arising from differential swelling is included in the governing equations. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|