Cure depth for photopolymerization of ceramic suspensions

The cure depth of a series of photopolymerizable SiO2 and Al2O3 ceramic suspensions was measured as a function of energy dose to determine the sensitivity parameter Dp and its dependence on ceramic volume fraction, type and concentration of photoinitiator and inert dye. As predicted by an Absorption Model for Dp, 1/Dp is a linear function of photoinitiator concentration and dye concentration. The molar extinction coefficients derived from the cure depth measurements using an Absorption Model were compared with coefficients determined via spectrophotometry.