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Otogo Be, S. A., Belec, L., Fahs, A., Martin, I., Louarn, G. & Chailan, J.-F. (2023) Impact of the sizing reactivity of glass fibers on composites hydrothermal aging. Polymer Degradation and Stability, 215 110426.
Added by: Richard Baschera (2023-08-17 13:13:20) Last edited by: Richard Baschera (2023-08-17 13:27:15) |
| Type de référence: Article DOI: 10.1016/j.polymdegradstab.2023.110426 Numéro d'identification (ISBN etc.): 0141-3910 Clé BibTeX: OtogoBe2023 Voir tous les détails bibliographiques  |
Catégories: MIOPS Mots-clés: epoxy composites, glass fibers, Hydrothermal aging, Interphase properties, Sizing reactivity Créateurs: Belec, Chailan, Fahs, Louarn, Martin, Otogo Be Collection: Polymer Degradation and Stability |
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| Liens URLs https://www.scienc ... /S0141391023001787 |
| Résumé |
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Epoxy composites were prepared with reactive and non-reactive sizings deposited on glass fibers. The resulting interphase properties have been studied during hydrothermal aging. The purpose here is to evaluate at nano and macroscale the dependence of aging, interfacial strength, and mechanical properties of model composites on the glass sizing reactivity. SEM/AFM, DMA and 3 points bending experiments have been done before and after water immersion at 70 °C for several weeks. Water diffusion kinetics have been found to be related only to the presence of sized glass fibers but not to the sizing reactivity. The SEM observations demonstrated a cohesive fracture at matrix/fiber in the case of composite elaborated with reactive sizing and an adhesive one in the case of non-reactive sizing, and this remains true with aging. Depending on the sizing nature and on the aging time, the evolution of interphase zones around fibers has been identified by a specific α-relaxation (Tan δ) and confirmed by AFM nanomechanical measurements. The results showed that the interphase thickness was almost the same at initial state (around 200 nm) for both composites, then it progresses with aging time to reach 400 nm and 500 nm (at 42 days) for reactive and non-reactive systems respectively. It suggests that water molecules diffusion is related to the hydrophilic character of the sizing and to the degree of cross-linking/or plasticization of the interphase during hydrothermal aging.
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