Fig. 5: Gel behavior of high viscosity resin systems.

a Photorheology test for gel point detection in difunctional bisphenol A epoxy acrylate formulation (RY1101/TMPTA = 7/3, 1 wt% UCPs, 20 W/cm2 NIR intensity) under NIR irradiation and under (b) UV irradiation (2 mW/cm2 UV intensity).