Two color of light for 3d printing, healing and erasing of polymeric materials.
발표자
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초록
내용
Light-driven 3D printing has drawn wide attention since it provides rapid printing speed and high feature resolution compared to other 3D printing techniques. Photocurable resins used for 3D printing necessarily includes multifunctional acrylate to grant excellent mechanical property; However, their thermoset nature hampers a decomposition of 3D printed objects and makes them difficult to be recycled. In this presentation, wavelength-orthogonal photochemistry is adopted to address this issue. Hexaarylbiimidazoles (HABIs) undergoes reversible cleavage upon UV/violet light irradiation and recombination to produce original structures in the dark. HABIs also undergo irreversible conversion to imidazole in the presence of hydrogen donors. HABI-based crosslinker was added to photocurable resins and utilized as backbone-borne functional groups to grant photo-mediated healing and degradation upon UV/violet light irradiation. To protect light sensitive functional unit during printing, longer wavelength of light (620 nm) was used.