Cationic photosensitive formulations based on silyl radical chemistry for green and red diode laser exposure

Polymer Chemistry Pub Date: 2011-12-13 DOI: 10.1039/C1PY00460C

Abstract

New photoinitiating systems allowing an efficient cationic photopolymerization of epoxides under air using different diode lasers are presented. These new photoinitiating systems are based on various three-component photoinitiating systems i.e. violanthrone-78 (or violanthrone-79, tris(2,2′-bipyridine)ruthenium(II) dichloride, methylene blue, and iridium(III) complexes)/diphenyl iodonium salt/tris(trimethylsilyl)silane. Excellent polymerization profiles with high monomer conversions were obtained. These results allow the design of less shrinkable high speed photopolymers usable in the visible wavelength range for a variety of applications in e.g. the manufacture of optical elements. A reaction mechanism is also proposed.

Graphical abstract: Cationic photosensitive formulations based on silyl radical chemistry for green and red diode laser exposure
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