| 초록 |
In the development of three-dimensional printable materials, we imposed self-standing and shape-memorable capability to an epoxy acrylate (EA) monomer to ensure a continuous filamentary 3D printing. Using octadecanamide (ODA) with EA, our material system distinctively exhibited rheological duality: Low-viscosity liquid-like behavior (~50 Pa∙s of viscosity) while passing through the nozzle, and self-standing solid-like behavior (~364 Pa of static yield stress) right after being printed. This reversible liquid-to-solid transitional capability was quantified by viscoelastic complex moduli providing a dynamic yield stress as 210 Pa corresponding to the upright stacking up to ca. 3.2 cm. The time required for the conformational rearrangement was evaluated as fast as ca. 0.01 sec. After UV curing, the 3D printed layers exhibited no air pockets or weld lines at the stacked interfaces, which could guarantee excellent mechanical performance and structural integrity. |
