Perovskites as potential UV photoinitiators for radical and cationic polymerizations

Haifaa Mokbel (1, 2) , Frederic Dumur (3) , Bernard Raveau (4) , Fabrice Morlet-Savary (1) , Corine Simonnet-Jégat (5) , Didier Gigmes (3) , Joumana Toufaily (2) , Tayssir Hamieh (2) , Jean Pierre Fouassier (1) , Jacques Lalevee (1)

1 IS2M - Institut de Science des Matériaux de Mulhouse
2 EDST - Ecole Doctorale des Sciences et de la Technologie
3 ICR - Institut de Chimie Radicalaire
4 CRISMAT - Laboratoire de cristallographie et sciences des matériaux
5 ILV - Institut Lavoisier de Versailles

Four perovskites (LaTiO3, LaCrO3, La0.6Sr0.4MnO3 and MAPbI3) are proposed here as new photoinitiators (e.g., free radical generators) in combination with iodonium salt and optionally another additive (N-vinylcarbazole—NVK) to initiate both radical and cationic photopolymerization reactions. The proposed systems are efficient phenyl radical generators under polychromatic light sources such as a halogen lamp or a Xe–Hg lamp. The interest of this approach is the ability to work with very stable inorganic structures as photoinitiators. To the best of our knowledge, this is the first time that perovskites are incorporated in photoinitiating systems. Photochemical mechanisms will be proposed as sustained by electron spin resonance spin trapping (ESR-ST) experiments.

Mots clés: Perovskites; Free radical initiators; Polymerization; Cationic polymerization; Photoinitiator; Polychromatic light

Domaines: Matériaux

Haifaa Mokbel, Frederic Dumur, Bernard Raveau, Fabrice Morlet-Savary, Corine Simonnet-Jégat, et al.. Perovskites as potential UV photoinitiators for radical and cationic polymerizations. Tetrahedron, 2016, 72 (48), pp.7686-7690. ⟨10.1016/j.tet.2016.03.057⟩. ⟨hal-01407858⟩