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Your search keyword '"Graff, Bernadette"' showing total 2 results
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2 results on '"Graff, Bernadette"'

1. Photoinitiation behavior of phenothiazines containing two oxime ester functionalities (OXEs) in free radical photopolymerization and 3D printing application

Author

Zhang, Yijun, Morlet-Savary, Fabrice, Schmitt, Michael, Graff, Bernadette, Rico, Alexandre, Ibrahim-Ouali, Malika, Dumur, Frédéric, Lalevée, Jacques, Institut de Science des Matériaux de Mulhouse (IS2M), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie Radicalaire (ICR), Aix Marseille Université (AMU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Moléculaires de Marseille (ISM2), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and ANR-20-CE07-0036,PhotoFlat,Des composés phosphorés à géométrie contrainte sous lumière visible: nouvelles opportunités en synthèse organique(2020)

Subjects
Process Chemistry and Technology, General Chemical Engineering, [CHIM]Chemical Sciences
Abstract

International audience; Twelve type I photoinitiators (PIs) containing two oxime esters functionalities on the terminal moiety were synthesized. These OXEs have high light absorptivities in the visible range, and some of them showed better photoinitiation abilities than the commercial photoinitiator diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO), under the irradiation of a 405 nm LED. Photoinitiation mechanisms of these OXEs are proposed through theoretical calculations, the detection of CO2, and the ESR investigation of the free radical generation. 3D Objects could be manufactured successfully by using the most reactive OXEs as photoinitiators with a stereolithographic 3D printer. In addition, these reactive OXEs also displayed a thermal initiation behavior, meaning that these OXEs can served as thermal or photochemical initiators.

Published
2023
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2. Multihydroxy-Anthraquinone Derivatives as Free Radical and Cationic Photoinitiators of Various Photopolymerizations under Green LED

Author

Jiacheng Zhao, Scott H. Kable, Bernadette Graff, Martina H. Stenzel, Jacques Lalevée, Timothy W. Schmidt, Michelle L. Coote, Pu Xiao, Jean-Pierre Fouassier, Jing Zhang, Nicholas S. Hill, Zhang, Jing, Hill, Nicholas S, Lalevee, Jacques, Fouassier, Jean-Pierre, Zhao, Jiacheng, Graff, Bernadette, Schmidt, Timothy W, Kable, Scott H, Stenzel, Martina H, Coote, Michelle L, and Xiao, Pu

Subjects
Polymers and Plastics, Tertiary amine, Free Radicals, Light, Radical, Anthraquinones, 02 engineering and technology, 010402 general chemistry, Photochemistry, DFT calculations, 01 natural sciences, Materials Chemistry, Reactivity (chemistry), Chemistry, Organic Chemistry, Photodissociation, Cationic polymerization, green LED, 021001 nanoscience & nanotechnology, Photochemical Processes, 0104 chemical sciences, Photopolymer, photopolymerization, Flash photolysis, 0210 nano-technology, Photoinitiator
Abstract

Refereed/Peer-reviewed Multihydroxy-anthraquinone derivatives [i.e., 1,2,4-trihydroxyanthraquinone (124-THAQ), 1,2,7-trihydroxyanthraquinone (127-THAQ), and 1,2,5,8-tetrahydroxyanthraquinone (1258-THAQ)] can interact with various additives [e.g., iodonium salt, tertiary amine, N-vinylcarbazole, and 2-(4-methoxystyryl)-4,6-bis(trichloromethyl)-1,3,5-triazine] under household green LED irradiation to generate active species (cations and radicals). The relevant photochemical mechanism is investigated using quantum chemistry, fluorescence, cyclic voltammetry, laser flash photolysis, steady state photolysis, and electron spin resonance spin-trapping techniques. Furthermore, the multihydroxy-anthraquinone derivative-based photoinitiating systems are capable of initiating cationic photopolymerization of epoxides or divinyl ethers under green LED, and the relevant photoinitiation ability is consistent with the photochemical reactivity (i.e., 124-THAQ-based photoinitiating system exhibits highest reactivity and photoinitiation ability). More interestingly, multihydroxy-anthraquinone derivative-based photoinitiating systems can initiate free radical crosslinking or controlled (i.e., reversible addition-fragmentation chain transfer) photopolymerization of methacrylates under green LED. It reveals that multihydroxy-anthraquinone derivatives can be used as versatile photoinitiators for various types of photopolymerization reactions. usc

Published
2018

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