Hybrid organic inorganic macromolecular photoinitiator system forvisible-light photopolymerization

IGNACIO DELL' ERBA; WALTER F SCHROEDER; GUSTAVO ARENAS; SILVANA V. ASMUSSEN; CLAUDIA I VALLO

PROGRESS IN ORGANIC COATINGS

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2014 vol. 77 p. 1848 - 1853

0300-9440

Hybrid organic?inorganic macrophotoinitiator bearing pendant tertiary amine groups (OI-AH) wasprepared by hydrolytic condensation of a silane containing amino groups. The macromolecular amino-functionalized photoinitiator was used in combination with camphorquinone (CQ) for visible-lightphoto-polymerization. The OI-AH was incorporated into methacrylate resins at loadings between 1 and10 wt.%. The photodecomposition of the CQ/OI-AH in methacrylate monomers under visible light irradia-tion ( = 470 nm) was examined. The photolysis products of CQ/OI-AH were transparent at the irradiatingwavelengths; consequently, the consumption of the CQ is accompanied by increased light intensity inthe underlying lays. The clean and rapid photobleaching of CQ in combination with OI-AH makes thisphotoinitiator system very attractive for polymerization of thick sections. The evolution of monomerconversion versus irradiation time showed that the OI-AH is an efficient co-initiator of CQ because a fastreaction and high conversion of methacrylate groups result after 60 s irradiation with a LED source of140 mW.Hybrid organic?inorganic macrophotoinitiator bearing pendant tertiary amine groups (OI-AH) wasprepared by hydrolytic condensation of a silane containing amino groups. The macromolecular amino-functionalized photoinitiator was used in combination with camphorquinone (CQ) for visible-lightphoto-polymerization. The OI-AH was incorporated into methacrylate resins at loadings between 1 and10 wt.%. The photodecomposition of the CQ/OI-AH in methacrylate monomers under visible light irradia-tion ( = 470 nm) was examined. The photolysis products of CQ/OI-AH were transparent at the irradiatingwavelengths; consequently, the consumption of the CQ is accompanied by increased light intensity inthe underlying lays. The clean and rapid photobleaching of CQ in combination with OI-AH makes thisphotoinitiator system very attractive for polymerization of thick sections. The evolution of monomerconversion versus irradiation time showed that the OI-AH is an efficient co-initiator of CQ because a fastreaction and high conversion of methacrylate groups result after 60 s irradiation with a LED source of140 mW.