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Rheological and adhesive properties of soft responsive hydrogels in aqueous media / M. Vahdati in RHEOLOGIE, Vol. 38 (12/2020)
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Titre : Rheological and adhesive properties of soft responsive hydrogels in aqueous media Type de document : texte imprimé Auteurs : M. Vahdati, Auteur Année de publication : 2021 Article en page(s) : np. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésifs biologiques
Adhésion
hydrocolloïdes
Résistance à l'humidité:Résistance à l'eau
Rhéologie
Test d'immersionIndex. décimale : 532.05 Mécanique des fluides et des liquides - Dynamique (cinétique et cinématique) Résumé : Developing generic adhesives which can stick onto different surfaces in the presence of water remains a major challenge. Such generic adhesives could be partly inspired from hydrophobic pressure-sensitive¬adhesives (PSAs) that rely on a fine balance of viscoelasticity to make rapid and intimate contact with substrates and dissipate large amounts of energy upon detachment. Indeed, typical PSAs lose their performance on wet substrates due to their compromised wetting properties and excessive swelling.
Natural organisms such as sandcastle worms exploit a rich variety of molecular interactions to achieve underwater (UW) adhesion. Our current knowledge of these sophisticated UW adhesives is limited to microscopic adhesion experiments on small sample quantities from these animals and/or macroscopic systems incorporating multiple interactions. The present work is the first to address rheological and adhesive properties of well-defined model systems based on individual molecular interactions under fully immersed conditions.
The first model system is an injectable hydrogel based on a novel copolymer composed of a thermo-responsive backbone and hydrophilic grafts. This topology allows the formation of a strong hydrophobie nano-scaffold just below body temperature. We have adapted a rheometer to perform reproducible probe tack experiments on these thermoresponsive hydrogels in both air and water. The second model system is based on complex coacervates from low molecular weight, hydrophilic polyelectrolytes, with a salt-induced sol-gel transition at physiological conditions. Based on sait concentration, these soft materials feature a wide range of mechanical proper¬ties from injectable fluids to viscoelastic sticky gels. We have proposed on a nanostructure based on Time Salt Superposition (TSS) and UW probe tack experiments. The insights from this study pave the road towards potentially safer biomedical adhesives.Note de contenu : - EXPERIMENTAL : Linear rheology in air and water - Probe tack in air and water
- RESULTS AND DISCUSSION : A thermally triggered injectable underwater adhesive - Coacervates as adhesives in physiological environmentPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35131
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