Polyaromatic Structures as Organo-Photoinitiator Catalysts for Efficient Visible Light Induced Dual Radical/Cationic Photopolymerization and Interpenetrated Polymer Networks Synthesis

Mohamad Ali Tehfe (1) , Jacques Lalevee (2) , Sofia Telitel (2) , Emmanuel Contal (3) , Frédéric Dumur (3) , Didier Gigmes (3) , Denis Bertin (3) , Malek Nechab (3) , Bernadette Graff (2) , Fabrice Morlet-Savary (2) , Jean-Pierre Fouassier (2)

1 LPIM - Laboratoire de Photochimie et d'Ingénierie Macromoléculaires
2 IS2M - Institut de Science des Matériaux de Mulhouse
3 ICR - Institut de Chimie Radicalaire

Different polyaromatic structures (truxene derivatives and tris(aza)pentacene) are presented as new metal-free organic photocatalysts (OPC) to promote free radical polymerization FRP and ring-opening polymerization (ROP) under halogen lamp, household LED bulb, and laser diode (405 nm). These OPCs exhibit interesting light absorption properties and lead, through an oxidative catalytic cycle, to the formation of radicals and ions that can initiate both free radical polymerization FRP and ring-opening polymerization ROP. Interestingly, excellent polymerization profiles are obtained even upon visible light exposure. Using these very soft irradiation conditions, acrylate/epoxide blends are also easily polymerized under air and lead to the formation of interpenetrated polymer networks IPN exhibiting no phase separation.

Domaines: Matériaux

Mohamad Ali Tehfe, Jacques Lalevee, Sofia Telitel, Emmanuel Contal, Frédéric Dumur, et al.. Polyaromatic Structures as Organo-Photoinitiator Catalysts for Efficient Visible Light Induced Dual Radical/Cationic Photopolymerization and Interpenetrated Polymer Networks Synthesis. Macromolecules, 2012, 45, pp.4454−4460. ⟨10.1021/ma300760c⟩. ⟨hal-01020213⟩