Sulfonium salt based charge transfer complexes as dual thermal and photochemical polymerization initiators for composites and 3D printing


Wang D., Kaya K. , Garra P., Fouassier J., Graff B., Yağcı Y. , ...More

POLYMER CHEMISTRY, vol.10, no.34, pp.4690-4698, 2019 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 10 Issue: 34
  • Publication Date: 2019
  • Doi Number: 10.1039/c9py00913b
  • Title of Journal : POLYMER CHEMISTRY
  • Page Numbers: pp.4690-4698

Abstract

Charge transfer complexes (CTCs) exhibit excellent initiating abilities as safe photo, thermal, or photo/thermal dual initiators, which cannot be achieved by classical initiators. New dual initiators based on a phenacyl sulfonium salt (ITXPhenS) acceptor and selected donors capable of initiating both thermal and photochemical polymerizations are investigated. Excellent dual initiating ability and long storage stability were examined by RT-FTIR and DSC experiments. The formations of the CTCs were confirmed by UV-vis spectroscopic investigations and MOC (Molecular Orbital Calculations). The application of the newly developed initiating system in laser writing experiments at 405 nm shows excellent spatial resolution performance. High-tech composites with tack free surfaces can be easily fabricated by employing these kinds of CTCs via fast photochemical curing of the surface associated with a thermal curing in depth. Both carbon fibers and glass fiber composites were prepared.