Direct and indirect methods for the Characterization of photoinitiator efficiency

By J.Ohngemach, M. Koehler, G. Wehner, E. Merck - RadTech Europe Conference 1989

This paper presents the results of an in-depth investigation of the reactivity of photocurable systems consisting of acrylated monomomers/oligomers and photoinitiators by using Photo Differential Scanning Calorimetry (Photo-DSC) . Thus, photoreactivity can be expressed accurately as a function of photoinitiator structure.

The results of these Photo-DSC measurements are compared with more traditional methods of photoreactivity measurement such as pendulum hardness and gel content measurement.