Two-photon photoinitiated polymerization
OPTICAL-DATA STORAGE; 2-PHOTON POLYMERIZATION; CROSS-LINKING; PHOTOPOLYMERIZATION; MICROFABRICATION; 4-METHYLENE-2-PHENYL-1, 3-DIOXOLANE; FABRICATION; EXCITATION; SYSTEM; Chemistry, Multidisciplinary; Chemistry, Physical; Polymer Science
The three-dimensional (3-D) spatial resolution of the two-photon absorption (2PA) process is being harnessed for 3-D microstructure fabrication and microlithography. In addition to the inherent spatial resolution of the two-photon excitation process, two-photon absorption can occur in certain materials at wavelengths well beyond that which monomers, polymers, and most organic substances absorb (one-photon), affording a greater depth of pcnetration and, in principle, creating little or no damage to the host. The near-IR two-photon induced free radical polymerization of (meth)acrylate monomers and the near-IR two-photon induced cationic polymerization of epoxide monomers using commercially available photoinitiator systems is described. We report the two-photon induced polymerization of a thiol-ene resin system utilizing near-IR radiation and a commercially available photoinitiator, isopropylthioxanthone (ITX). Polymerization depths of over 2 cm were achieved, demonstrating a new paradigm for deep curing of adhesives.
"Two-photon photoinitiated polymerization" (2003). Faculty Bibliography 2000s. 3621.