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Examples of two commonly used PI molecules: Irgacure 2959 (2‐hydroxy‐4′‐(2‐hydroxyethoxy)‐2‐methylpropiophenone) and LAP (lithium phenyl‐2,4,6‐trimethylbenzoylphosphinate), generating two free radicals after cleavage with UV light (hv). These two free radicals will then attack functional groups on the hydrogel to initiate the polymerization reaction. Source: Adapted from Fairbanks et al49
