Abstract
Hydrogels are excellent candidates for biomedical applications but often show poor resistance to fracture. Recent development in the field, such as lamellar gels, aimed at improving their mechanical properties. Here, we study lamellar gels composed of rigid and hydrophobic bilayers of self-assembled polymeric DGI (Dodecyl Glyceryl Itaconate) molecules periodically intertwined in soft and elastic polyacrylamide (PAAm) hydrogel (called PDGI/PAAm hydrogels), which, thanks to their anisotropic structure, constitute good model systems to mimic the properties of biotissues such as skin and muscle. In this paper, we present an analysis of the dynamic mechanical properties of PDGI/PAAm gels depending on their structure, along with an examination of the different energy dissipation mechanisms at play. Using tensile testing, we show for the first time that the relaxation process is due to the rupture of physical bonds within the PDGI bilayers, with a characteristic time in the order of 10 s.
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