Photoinitiators-hydroperoxides peroxides

Photoinitiator/Peroxide or Hydroperoxide-Based Systems In these systems where useful effects occur [li], oxygen-centered radicals are generated the mechanism is not clear. In the same way, in the 1-benzoyl-cyclohexanol HAP/benzophenone BP system under air, the radicals that are formed after the a-cleavage of HAP consume oxygen and further allow the generation of a hydroperoxide ROOH whose decomposition is sensitized by BP, and so on. 

Free-radical initiated copolymerization can be accomplished either by conventional initiation with organic peroxides or hydroperoxides or phytochemically by using a photoinitiator in UV light. A detailed discussion of UV cured systems is outside the scope of this section therefore, only conventional initiation Is discussed here. The conventional curing of unsaturated polyester resins can proceed either by... 

It has been found that the photoinitiation rates of acrylic urethane and acrylic melamine coatings depend primarily upon the nature and concentration of chromophores that are incorporated into the acrylic copolymer during polymerization [731, 732]. The primary chromophores for conventional polymerization (peroxide and hydroperoxide initiators in ketone solvents) are ketonic end-groups [359, 735]. 

Thermal initiation Hydroperoxide initiation Peroxide initiation Cl. Ammonium per-sulfate e2. Potassium persulfate e3. Sodium persulfate Photoinitiation... 

---