scholarly journals Azacalixphyrins as an Innovative Alternative for the Free-Radical Photopolymerization under Visible and NIR Irradiation without the Need of Co-Initiators

2021 ◽  
Author(s):  
Davy-Louis Versace ◽  
Louise Breloy ◽  
V. Brezova ◽  
Jean-Pierre Malval ◽  
Denis Jacquemin ◽  
...  
Keyword(s):  
Free Radical ◽  
Near Infrared ◽  
Spin Trapping ◽  
Strong Absorption ◽  
Free Radical Photopolymerization ◽  
Spectral Ranges ◽  
Epr Spin Trapping

Azacalixphyrins are unique aromatic macrocycles featuring strong absorption from the visible to the near-infrared (NIR) spectral ranges. This work demonstrates through EPR spin-trapping experiments that the N-alkyl tetrasubstituted azacalixphyrin (ACP)...

scholarly journals Free radical generation induced by ultrasound in red wine and model wine: An EPR spin-trapping study

2015 ◽  
Vol 27 ◽  
pp. 96-101 ◽  
Author(s):  
Qing-An Zhang ◽  
Yuan Shen ◽  
Xue-hui Fan ◽  
Juan Francisco García Martín ◽  
Xi Wang ◽  
...  
Keyword(s):  
Free Radical ◽  
Red Wine ◽  
Spin Trapping ◽  
Free Radical Generation ◽  
Radical Generation ◽  
Epr Spin Trapping

scholarly journals Reaction between Peroxynitrite and Boronates: EPR Spin-Trapping, HPLC Analyses, and Quantum Mechanical Study of the Free Radical Pathway

2011 ◽  
Vol 24 (5) ◽  
pp. 687-697 ◽  
Author(s):  
Adam Sikora ◽  
Jacek Zielonka ◽  
Marcos Lopez ◽  
Agnieszka Dybala-Defratyka ◽  
Joy Joseph ◽  
...  
Keyword(s):  
Free Radical ◽  
Spin Trapping ◽  
Quantum Mechanical ◽  
Mechanical Study ◽  
Quantum Mechanical Study ◽  
Epr Spin Trapping ◽  
Hplc Analyses

scholarly journals EPR spin trapping of an oxalate-derived free radical in the oxalate decarboxylase reaction

2011 ◽  
Vol 50 (8) ◽  
pp. 1009-1015 ◽  
Author(s):  
Witcha Imaram ◽  
Benjamin T. Saylor ◽  
Christopher P. Centonze ◽  
Nigel G.J. Richards ◽  
Alexander Angerhofer
Keyword(s):  
Free Radical ◽  
Spin Trapping ◽  
Oxalate Decarboxylase ◽  
Epr Spin Trapping

scholarly journals Lawsone Derivatives as Efficient Photopolymerizable Initiators for Free-Radical, Cationic Photopolymerizations, and Thiol—Ene Reactions

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 2015
Author(s):  
Christine Elian ◽  
Vlasta Brezová ◽  
Pauline Sautrot-Ba ◽  
Martin Breza ◽  
Davy-Louis Versace
Keyword(s):  
Free Radical ◽  
Paramagnetic Resonance ◽  
Ene Reactions ◽  
Ene Reaction ◽  
Free Radical Photopolymerization ◽  
Abstraction Reaction ◽  
Epoxy Monomer ◽  
Iodonium Salt ◽  
Epr Spin Trapping ◽  
Electron Paramagnetic

Two new photopolymerizable vinyl (2-(allyloxy) 1,4-naphthoquinone, HNQA) and epoxy (2-(oxiran-2yl methoxy) 1,4-naphthoquinone, HNQE) photoinitiators derived from lawsone were designed in this paper. These new photoinitiators can be used as one-component photoinitiating systems for the free-radical photopolymerization of acrylate bio-based monomer without the addition of any co-initiators. As highlighted by the electron paramagnetic resonance (EPR) spin-trapping results, the formation of carbon-centered radicals from an intermolecular H abstraction reaction was evidenced and can act as initiating species. Interestingly, the introduction of iodonium salt (Iod) used as a co-initiator has led to (1) the cationic photopolymerization of epoxy monomer with high final conversions and (2) an increase of the rates of free-radical polymerization of the acrylate bio-based monomer; we also demonstrated the concomitant thiol–ene reaction and cationic photopolymerizations of a limonene 1,2 epoxide/thiol blend mixture with the HNQA/Iod photoinitiating system.

Kinetic analysis-based quantitation of free radical generation in EPR spin trapping

2004 ◽  
Vol 334 (1) ◽  
pp. 145-154 ◽  
Author(s):  
Alexandre Samouilov ◽  
Valerie Roubaud ◽  
Periannan Kuppusamy ◽  
Jay L. Zweier
Keyword(s):  
Free Radical ◽  
Kinetic Analysis ◽  
Spin Trapping ◽  
Free Radical Generation ◽  
Radical Generation ◽  
Epr Spin Trapping
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