Visible macrophotoinitiators with Si-H: High efficient anti-oxygen inhibition and modified cured polymer materials

Abstract

The development of multifunctional, highly antioxidant macromolecular visible light initiators has attracted great interest from chemists. This protocol has successfully designed and prepared a series of naphthalimide terminated polysiloxane photoinitiators (ND-HPSOs) containing silicon-hydride, with good compatibility in photopolymerization monomers. These photoinitiators could be generate silyl and carbon radicals under the visible LED light irradiation, demonstrated by the ESR spin-trapping experiment. The results of real-time infrared spectra (RT-IR) show that they could be server as efficient one-component visible photoinitiators with an ability to initiate the polymerization of acrylate monomers in the air. Moreover, the formation of reactive silyl radicals directly affects the reduction or elimination of oxygen inhibition. Meanwhile, the ND-HPSOs exhibited to excellent migration stability in the cured 1,6-hexanediol diacrylate films. Notably, employment the multifunctional photoinitiators ND-HPSOs in the photocuring of polyurethane acrylate (PUA) films could change the surface of photo-cured films from hydrophilicity to hydrophobicity and improve their thermal stability, water and ethanol repellency.