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The most significant method of cure for acrylated oligomers and monomers is through the use of UV light and a PI. The PI acts as the catalyst to free-radically cure the system instantaneously. An example of a PI is hydroxypropiophenone shown in Figure 3.2.

The cleavage reaction of 2-hydroxy-2-methyl-1-phenyl-propan-1-one when it is photolyzed is shown in Figure 3.2. This proposed cleavage goes through a very short duration triplet state and decomposes by α-splitting to give a benzoyl radical and a 2-hydroxy-2-propyl radical which cross-link the system [2, 3].

Figure 3.2 Photoinitiation: UV light hits the 2-hydroxy-2-methyl-1-phenyl-propan-1-one resulting in a cleavage reaction that goes through a short duration triplet state and then decomposes by splitting to give a benzoyl radical and a 2-hydroxy-2-propyl radical which cross-link the system.