Jingcheng Liu, Jiangnan University
Abstract: UV-curable polyurethane (UV-PUA) was synthesized based on polycarbonate diols (PCDL) with different molecular weight and end-capping groups. Methylacrylate-β-hydroxyethyl methacrylate (HEMA) and pentaerythritol triacrylate (PET3A) was used to impart mono-methacrylate, and tri-acrylate functionality to the end-capping group, respectively. FTIR, GPC, UV spectroscopy and tensile test were used to characterize the UV-PUA. The results showed that: with the increasing of the molecular weight of PCDL, the molecular weight and viscosity of the UV-PUA was increasing, Young's modulus of the UV-curable film becomes smaller but the elongation at break becomes larger in the tensile test; The molecular weight and viscosity of the UV-PUA end-capped by PET3A was larger than those end-capped by HEMA, Young's modulus of the UV-curable film of the former was larger than the latter, but the elongation at break was smaller. All the films of UV-PUA showed excellent chemical resistance.