| 초록 |
A UV curable acryl-polyurethane is successfully prepared by a combination of polyethylene glycol (PEG) as polyols, hexamethylene diisocyanate (HDI) as an isocyanate, hydroxyethyl-methacrylate (HEMA) as multifunctional acrylate and diphenyl(2,4,6-trimethyl-benzoyl)phosphine oxide (TPO) was used to photo initiator. The crosslinking step of acryl-polyurethane elastomers were processed using 385~405nm radiation for DLP 3D printing by controlling the viscosity and UV curing time. The functional group of the resulting acryl-polyurethane was evaluated by fourier transform infrared spectroscopy (FT-IR). The molecular weight was evaluated by gel chromatography (GPC). The mechanical properties such as tensile strength, elongation, modulus and flexural strength were evaluated by universal testing machine(UTM). The viscosity was evaluated by viscometer. The surface resolution-quality of the 3D structure was analyzed by field emission scanning electron microscope (FESEM). |
