Joost Brancart - Speaker

Stimuli-responsive materials change their properties with respect to applied stimuli. Stimuli such as heat, light, electrical or magnetic fields can be used change the material’s chemical structure, conformation or configuration. For self-healing applications, material scientists and engineers are developing materials that are able to repair damage upon the application of a stimulus. Ideally, the mechanical work from the damaging action activates a mechanism that allows the materials to repair the damage. In addition, the mechanical force acting on a material can result in a measurable change in electrical conductivity in conductive materials, which allows sensors to evaluate the deformation. The Diels-Alder chemistry is one of the most popular chemistries to create thermally reversible polymer network materials with the ability to repair damage. The reversibility of the Diels-Alder reaction can be activated thermally, allowing thermal reprocessing of elastomers, filament extrusion and printing, thermal healing ... Soft actuator prototypes made using these self-healing materials have demonstrated successful damage repair and recovery of their performance. The reversibility can also be activated mechanically, allowing autonomous healing of damage. Furthermore, photoreversible chemistries may prove very interesting for self-healing applications thanks to the excellent temporal and spatial control of the photostimulus.
20 Nov 2019

External organisation (Academic)

NameEcole Polytechnique Fédérale de Lausanne

ID: 48828281