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Fracture of dual-crosslink dynamic hydrogels : from molecular interactions to fracture energy

Abstract : This projects is part of an ambitious global project, which objective is to understand the mechanisms of fracture propagation in a soft material. The materials used during this PhD will mostly be hydrogels, whether with simple or double reticulation (chemical and physical). The introduction of dynamic (physical) bonds allows te delaying of the breaking of covalent (chemical) bonds, and increases the energy of failure. To this day, no model exists that would allow fracture prediction from the molecular structure. The objective of this project is thus to combine different technics to detect breaking at different scales. At macroscopic level, the speed of the fracture propagation and its triggering conditions will be studied. At the mesoscopic scale, the strain field at the fracture tip will be studied by digital image correlation or by the use of fluorescent particles. At the molecular scale, one possibility will be to use mecanophorous molecules, a technique already applied with success within the laboratory to detect the forces acting on molecules and bond breakings.
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  • HAL Id : tel-03163056, version 1

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Louis Debertrand. Fracture of dual-crosslink dynamic hydrogels : from molecular interactions to fracture energy. Polymers. Université Paris sciences et lettres, 2020. English. ⟨NNT : 2020UPSLS027⟩. ⟨tel-03163056⟩

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