https://www.uvabsorber.com/products/amine-synergists/ Amine synergists are also called photosensitizers. Photosensitizers are molecules that do not absorb radiation or initiate polymerization reactions but can increase the effective rate of photoinitiator activity. These acrylated amine synergists are usually amine compounds. The role of amine synergist is to increase the photosensitivity of photoinitiator and accelerate the curing of the system.