[article]
| Titre : |
Fracture of dynamic dual-crosslink hydrogels |
| Type de document : |
texte imprimé |
| Auteurs : |
Costantino Creton, Auteur ; T. Narita, Auteur |
| Année de publication : |
2021 |
| Article en page(s) : |
n.p. |
| Note générale : |
Bibliogr. |
| Langues : |
Français (fre) |
| Catégories : |
Hydrocolloïdes -- Propriétés mécaniques
Réticulation (polymérisation)
Rhéologie
|
| Index. décimale : |
532.05 Mécanique des fluides et des liquides - Dynamique (cinétique et cinématique) |
| Résumé : |
Hydrogels, as soft and wet solids, attract great interest in bio-medical applications. Their use is however limited by their high fragility and brittleness, linked in large part to the lack of energy dissipation mechanism which can prevent crack propagation. A lot of progress has been done on toughening hydrogels, especially by incorporation of a mechanism of energy dissipation inside the hydrogel. For example, double-network hydrogels dissipate energy by irreversible breaking of one of the two interpenetrated networks [3]. This project aimed at toughening a classic single network chemical hydrogel by incorporating an energy dissipation mechanism, by reversible breaking/healing of physical crosslinks. Such dynamic gels have been widely studied in the literature, while no systematic work has been reported on the relationship between the bond breaking dynamics and the linear, nonlinear and fracture properties at different experimental time scales. Here are presented novel "dual crosslink" hydrogels having a small amount of chemical crosslinks and a large amount of transient, physical crosslinks, based on coordination complexes between a metallic ion and two ligands on the polymer chains. The lifetime of these bonds is tunable simply by changing the metal ion. The goal was to obtain a unified mechanical behavior of the hydrogels, in a wide range of solicitation rates relative to the lifetime of the bonds and to understand the influence of a controlled and dynamic energy dissipation mechanism on the linear and nonlinear mechanical behaviors of the material. A wide range of Weissenberg number is covered : at low values the physical bonds are expected to be dissociated and invisible, while they are supposed to be permanent at high Weissenberg numbers. |
| Note de contenu : |
- Linear rheology and dynamics
- Large deformations behavior |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36978 |
in RHEOLOGIE > Vol. 40 (12/2021) . - n.p.
[article]
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