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Light-Harvesting Organic Photoinitiators of Polymerization

Authors

  • Jacques Lalevée,

    Corresponding author
    1. Institut de Science des Matériaux de Mulhouse, IS2M–LRC CNRS 7228–ENSCMu-UHA; 15, rue Jean Starcky, 68057 Mulhouse Cedex, France
    • Institut de Science des Matériaux de Mulhouse, IS2M–LRC CNRS 7228–ENSCMu-UHA; 15, rue Jean Starcky, 68057 Mulhouse Cedex, France
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  • Mohamad-Ali Tehfe,

    1. Institut de Science des Matériaux de Mulhouse, IS2M–LRC CNRS 7228–ENSCMu-UHA; 15, rue Jean Starcky, 68057 Mulhouse Cedex, France
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  • Frédéric Dumur,

    1. Aix-Marseille Université, CNRS Institut de Chimie Radicalaire, UMR 7273, équipe CROPS, case 542, Faculté des, Sciences de Saint Jérôme, Avenue Escadrille, Normandie Niémen, 13397 Marseille Cedex 20, France
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  • Didier Gigmes,

    Corresponding author
    1. Aix-Marseille Université, CNRS Institut de Chimie Radicalaire, UMR 7273, équipe CROPS, case 542, Faculté des, Sciences de Saint Jérôme, Avenue Escadrille, Normandie Niémen, 13397 Marseille Cedex 20, France
    • Aix-Marseille Université, CNRS Institut de Chimie Radicalaire, UMR 7273, équipe CROPS, case 542, Faculté des, Sciences de Saint Jérôme, Avenue Escadrille, Normandie Niémen, 13397 Marseille Cedex 20, France.
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  • Bernadette Graff,

    1. Institut de Science des Matériaux de Mulhouse, IS2M–LRC CNRS 7228–ENSCMu-UHA; 15, rue Jean Starcky, 68057 Mulhouse Cedex, France
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  • Fabrice Morlet-Savary,

    1. Institut de Science des Matériaux de Mulhouse, IS2M–LRC CNRS 7228–ENSCMu-UHA; 15, rue Jean Starcky, 68057 Mulhouse Cedex, France
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  • Jean-Pierre Fouassier

    1. UHA-ENSCMu, 3 rue Alfred Werner, 68093 Mulhouse, France
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Abstract

Two new photoinitiators with unprecedented light absorption properties are proposed on the basis of a suitable truxene skeleton where several UV photoinitiators PI units such as benzophenone and thioxanthone are introduced at the periphery and whose molecular orbitals MO can be coupled with those of the PI units: a red-shifted absorption and a strong increase of the molecular extinction coefficients (by a ≈ 20–1000 fold factor) are found. These compounds are highly efficient light-harvesting photoinitiators. The scope and practicality of these photoinitiators of polymerization can be dramatically expanded, that is, both radical and cationic polymerization processes are accessible upon very soft irradiation conditions (halogen lamp, LED…) thanks to the unique light absorption properties of the new proposed structures.

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