Properties of Water-soluble Hyperbranched Polyurethane Acrylate Films

A kind of novel water-soluble hyperbranched polyurethane acrylate was synthesized based upon the raw materials of toluene 2,4-diisocyanate(TDI),hydroxypropyl acrylate(HPA),succinic anhydride and hyperbranched aliphatic polyester(HBPE).The transformations of different groups were characterized using Fourier transform infrared during the synthesis process.The thermal properties of the UV-curable films show that thermal degradation temperature increases from 171.0℃to 238.9℃,and the glass transition temperature by 56.2℃ up to 72.8℃ with increasing acrylate group content in the polymers.The mechanical properties of the UV-curable films of the water-soluble hyperbranched polyurethane acrylates were measured.The results show that the pencil hardness increases with TDI·HPA content increasing in the polymers,but the flexibility and impact strength are degressive trend.