Abstract

The UV-curable hyperbranched urethane acrylate (HBUA) with a multi-hydroxyl functional hyperbranched polyester core was synthesized via a two-step procedure. The products were characterized by size exclusion chromatography, Fourier transform infrared spectroscopy, proton nuclear magnetic resonance, and thermogravimetric analysis. The mechanical properties of UV-cured HBUA films were also investigated. The polydispersity index of HBUA is 2.31 and the endcapped degree of acrylation is 79.8%. The viscosity of HBUA is relatively low in favor of mixing and spreading. The UV-cured films exhibit high hardness and good flexibility.

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