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3D-printed gradient-like poly(L,L-lactide)-based auxetic materials for bone regeneration applications

par Mincheva, Rosica;Odent, Jeremy;Abdeljawad, M.B.;Lambert, Pierre ;Raquez, Jean-Marie
Référence Progress in additive manufacturing, 10, 10, page (7579-7588)
Publication Publié, 2025-03-19

Article révisé par les pairs

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Résumé :

3D-printed poly(L,L-lactide) (PLLA)-based auxetic metamaterials with non-conventional re-entrant honeycomb auxetic cell architectures and compositional gradients of successive PLLA and plasticized PLLA layers are formed. For plasticized PLLA, melt-plasticization was conducted with hydrophilic poly(ethylene glycol) (PEG, 10 and 20 wt%) as an efficient PLLA plasticizer for bone-regeneration applications providing polyester chain mobility, ductility, drawability, and hydrophilicity. Programming these structures leads to the design of bone substituting materials (BSMs), combining high strength as well as energy absorption into a single device during fused deposition modeling (FDM) fabrication. The latter leads to the design of unique bone substituting materials adequately addressing the porosity, the compressive modulus and the impact strength of the natural cancellous bone that has never reported. Lattice structure (grid and re-entrant honeycomb patterns), infill density (100% and 50%), printing orientation (0° and 90°), unit cell size (differing by 20%) and chemical composition (PLLA and plasticized PLLA) were evaluated to establish structure-properties relationships.