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After initiation, the conversion of the product into a cured solid material proceeds as a normal bulk free radical polymerization and continues to propagate as shown in Figure 3.1, the propagation reaction.

Figure 3.1 Free radical polymerization: photoinitiators absorb light energy that generate free radicals (initiation), the conversion of the product into a cured solid material proceeds as a normal bulk free radical polymerization and continues to propagate (propagation), chain transfer reaction then occurs in which an active center is transferred from a growing oligomer molecule to another molecule (chain transfer) and then termination reaction occurs involving the growing polymer sites reacting together (termination).