| 초록 |
Thermoplastic UV-curable PU was successfully synthesized by the additional reaction of methylene diphenyl diisocyanate (MDI), poly(tetramethylene ether) glycol, and several diacrylate derivatives as a crosslinking point. The crosslinked PU-acrylate elastomers were formed by the short exposure to 300~400μm UV radiation. The structures and properties of the resulting Acryl-PUs were evaluated by Fourier transform infrared spectroscopy (FT-IR), 1H nuclear magnetic resonance (1H NMR), gel permeation chromatography (GPC), and Universal Test Machine (UTM). The flow dependence of photo-curing rate was studied using viscosity tests. The increase of diacrylate concentration in PU-acrylate elastomers led to higher tensile strength and hardness due to the increased crosslinking density and the enhanced interchain hydrogen bonding. |
