Synthesis,characterization and photosensitive properity of a novel UV-curable polyurethane methylacrylate

A novel UV-curable polyurethane methylacrylate prepolymer(PUMA) for bonding crystal decorationswas synthesized and its structure was characterized by FT-IR and GPC.The effect of photoinitiators and reactive monomers on photosensitive property of PUMA system was investigated.The results showed that the efficiency of TPO initiator system was the best and the value of sensitivity of the system containing TPO was 8.75 mJ/cm2.The optimum content of photoinitiator in the photosensitive systems was 4%~6% by weight.Multifunctional monomer and monomer with flexible molecular chain can increase the curing rate of the PUMA system.The curing rate of system composed of TPGDA and PUMA was higher and its curing film possessed good flexibility.