| 초록 |
Photo-curable Polyurethane was successfully synthesized by the additional reaction of methylene diphenyl diisocyanate (MDI), poly(tetramethylene ether) glycol 1000, and tri-acrylate derivatives as a crosslinking point. Synthesis of Polyurethane was confirmed by fourier transform infrared spectroscopy (FT-IR), gel permeation chromatography (GPC). The photoinitiator used the benzophenone. The crosslinked PU-acrylate elastomers were fabricated by the exposure to 200~400μm UV radiation. DMF was used as a solvent for the synthesis, but THF with low UV cut off was used to crosslinked the PU-acrlyate in order to reduce crosslinking time. The mechanical, thermal and optical properties of the polyurethane film before curing and the cured film were compared. All physical properties were confirmed by UTM, UV-Vis and DSC. Tensile strength was measured from 0.13 to 0.48MPa. The short photocuring time and mechanical strength confirmed the applicability as a 3D Printing material. |
