Evaluation of the isothermal curing process of UV-cured resin in terms of elasticity studied through micro-Brillouin light scattering

ABSTRACTThe isothermal curing process of two photopolymers were studied using micro-Brillouin spectroscopy, which is a powerful tool for probing the local elasticity of condensed matters. The Brillouin frequency shift and the half width of the longitudinal acoustic mode showed significant changes during curing under ultraviolet (UV) irradiation, and became saturated after complete curing. These were closely correlated with the changes in the optical characteristics of the white light-emitting diodes, where the same photopolymers were used as a matrix for phosphor inclusion. These results indicate that micro-Brillouin spectroscopy may be an effective tool for monitoring the curing process of resins in various applications.