New bio-sourced hydrogen donors as high performance coinitiators and additives for CQ-based systems: Toward aromatic amine-free photoinitiating systems

Two new hydrogen-donors synthesized from natural products (curcumin and 4-methylumbelliferone) are proposed here as new classes of high performance bio-sourced coinitiators (BHD) for the polymerization of methacrylates under blue light irradiation. In presence of these naturally derived compounds good polymerization performances are reached and good bleaching properties are obtained compared to traditionally used camphorquinone (CQ)-based systems.