Photopolymerization of
Cationic Monomers and Acrylate/Divinylether
Blends under Visible Light Using Pyrromethene Dyes
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Abstract
New photoinitiating systems based on boron-dipyrromethene
dye (bodipy)/iodonium
salt and optionally tris(trimethylsilyl)silane are proposed for the
polymerization of divinylether and epoxy monomers upon visible-light
exposure. The presence of the silane increases the epoxide rate of
polymerization and conversion. Using acrylate/vinyl ether blends,
the synthesis of cross-linked polymer networks (possessing two <i>T</i><sub>g</sub> values: −11 and 111 °C) is also
successfully achieved through concomitant cationic and radical polymerization
pathways. The chemical mechanisms associated with these initiating
systems are investigated by steady-state photolysis and ESR experiments