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6.5, while the following sections deal with the basic principles of photopoly-
merization and the relevant materials.
6.2 Photopolymerization
Photopolymerization refers to the irreversible transformation of a liquid
polymerizable formulation into a stable solid triggered by the action of light
(Fouassier, 1995). The main advantage of photopolymerization is the abil-
ity to cure solvent-free formulations within a fraction of a second with high
temporal and spatial control. This process is faster and more energy ef cient
than thermally induced polymerization. On the other hand, the main draw-
backs ...