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Thermally Triggered Injectable Underwater Adhesives

Abstract : We report a novel bioinspired underwater adhesive based on the injectable aqueous solution of a graft copolymer with a thermoresponsive backbone, which turns into a sticky hydrogel just below body temperature. With this topology, the collapse of the backbones upon the thermal transition leads to the formation of a percolating network of strong hydrophobic domains. Similar to Pressure-Sensitive Adhesives (PSAs), the hydrogel goes through fibrillation and extensive energy dissipation in large deformations, giving it an edge over conventional chemical hydrogels which are typically elastic and inherently non-sticky. This capability comes from the hydrophobic nano-scaffold which resists large deformations to minimize its contact with water. Since hydrophobic interactions are not weakened in water, the behavior of the hydrogel is maintained in aqueous medium. Chemistry-insensitive adhesion of this hydrogel offers a major advantage over current injectable adhesives which rely on in-situ chemical crosslinking reactions with tissues.
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Submitted on : Friday, March 13, 2020 - 9:40:56 AM
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Mehdi Vahdati, Guylaine Ducouret, Costantino Creton, Dominique Hourdet. Thermally Triggered Injectable Underwater Adhesives. Macromolecular Rapid Communications, Wiley-VCH Verlag, 2020, pp.1900653. ⟨10.1002/marc.201900653⟩. ⟨hal-02507344⟩

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