scholarly journals Triazine-Based Type-II Photoinitiating System for Free Radical Photopolymerization: Mechanism, Efficiency, and Modeling

2017 ◽  
Vol 218 (18) ◽  
pp. 1600597 ◽  
Author(s):  
Julien Christmann ◽  
Xavier Allonas ◽  
Christian Ley ◽  
Ahmad Ibrahim ◽  
Céline Croutxé-Barghorn
Keyword(s):  
Free Radical ◽  
Type Ii ◽  
Free Radical Photopolymerization

scholarly journals Monocomponent Photoinitiators based on Benzophenone-Carbazole Structure for LED Photoinitiating Systems and Application on 3D Printing

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1394 ◽  
Author(s):  
Shaohui Liu ◽  
Hong Chen ◽  
Yijun Zhang ◽  
Ke Sun ◽  
Yangyang Xu ◽  
...  
Keyword(s):  
Free Radical ◽  
3D Printing ◽  
Rational Design ◽  
Photophysical Properties ◽  
Synergetic Effect ◽  
Type Ii ◽  
Visible Absorption ◽  
Free Radical Photopolymerization ◽  
Iodonium Salt ◽  
Resonance Spin

In this article, different substituents (benzoyl, acetyl, styryl) are introduced onto the carbazole scaffold to obtain 8 novel carbazole derivatives. Interestingly, a benzoyl substituent, connected to a carbazole group, could form a benzophenone moiety, which composes a monocomponent Type II benzophenone-carbazole photoinitiator (PI). The synergetic effect of the benzophenone moiety and the amine in the carbazole moiety is expected to produce high performance photoinitiating systems (PISs) for the free radical photopolymerization (FRP). For different substituents, clear effects on the light absorption properties are demonstrated using UV-Visible absorption spectroscopy. Benzophenone-carbazole PIs can initiate the FRP of acrylates alone (monocomponent Type II photoinitiator behavior). In addition, fast polymerization rates and high function conversions of acrylate are observed when an amine and/or an iodonium salt are added in systems. Benzophenone-carbazole PIs have good efficiencies in cationic photopolymerization (CP) upon LED @ 365 nm irradiation in the presence of iodonium salt. In contrast, other PIs without synergetic effect demonstrate unsatisfied photopolymerization profiles in the same conditions. The best PIS identified for the free radical photopolymerization were used in three-dimensional (3D) printing. Steady state photolysis and fluorescence quenching experiments were carried out to investigate the reactivity and the photochemistry and photophysical properties of PIs. The free radicals, generated from the studied PISs, are detected by the electron spin resonance - spin trapping technique. The proposed chemical mechanisms are provided and the structure/reactivity/efficiency relationships are also discussed. All the results showed that the benzophenone-carbazole PIs have a good application potential, and this work provides a rational design route for PI molecules. Remarkably, BPC2-BPC4, C6, C8 were never synthetized before; therefore, 5 of the 8 compounds are completely new.

scholarly journals Cubane Cu4I4(phosphine)4 Complexes as New Co-initiator for Free Radical Photopolymerization: Towards Aromatic Amine-Free Systems

2021 ◽  
Author(s):  
Jacques Lalevée ◽  
Fatima Hammoud ◽  
Mahmoud Rahal ◽  
Julien Egly ◽  
Fabrice Morlet-Savary ◽  
...  
Keyword(s):  
Free Radical ◽  
Radical Polymerization ◽  
Aromatic Amine ◽  
Free Radical Polymerization ◽  
Copper Iodide ◽  
Free Radical Photopolymerization ◽  
Acrylate Monomers ◽  
First Time

The investigation of copper-iodide cubane derivatives as new co-initiators for the free radical polymerization (FRP) of acrylate monomers under mild irradiation conditions is described for the first time here. These...

Star-shaped Polymers through Simple Wavelength-Selective Free-Radical Photopolymerization

2017 ◽  
Vol 56 (45) ◽  
pp. 14306-14309 ◽  
Author(s):  
Anna Eibel ◽  
David E. Fast ◽  
Jürgen Sattelkow ◽  
Michal Zalibera ◽  
Jieping Wang ◽  
...  
Keyword(s):  
Free Radical ◽  
Free Radical Photopolymerization

Photopolymerization of methyl methacrylate: effects of photochemical and photonic parameters on the chain length

2014 ◽  
Vol 5 (21) ◽  
pp. 6236-6243 ◽  
Author(s):  
V. Charlot ◽  
A. Ibrahim ◽  
X. Allonas ◽  
C. Croutxé-Barghorn ◽  
C. Delaite
Keyword(s):  
Free Radical ◽  
Methyl Methacrylate ◽  
Chain Length ◽  
Free Radical Photopolymerization

The effects of photochemical and photonic parameters are investigated on the chain length of poly(methylmethacrylate) (PMMA) as formed by the free radical photopolymerization process.

Substituent Effects on Photoinitiation Ability of Coumarin-Based Oxime-Ester Photoinitiators for Free Radical Photopolymerization

2021 ◽  
Author(s):  
Jacques Lalevée ◽  
Fatima Hammoud ◽  
Nicolas giacoletto ◽  
Guillaume Noirbent ◽  
Bernadette Graff ◽  
...  
Keyword(s):  
Free Radical ◽  
Visible Light ◽  
Substituent Effects ◽  
Free Radical Photopolymerization

In this paper, a series of coumarin chromophore-based oxime-esters was designed and synthesized as visible light photoinitiators (PIs). Interestingly, upon exposure to irradiation of a LED at 405 nm, the...

Antioxidant Activity of Silk Peptide and Co-initiation Behavior in Free Radical Photopolymerization of Acrylamide

2019 ◽  
Vol 20 (8) ◽  
pp. 1555-1563 ◽  
Author(s):  
Xuying Nan ◽  
Lili Sun ◽  
Xinming Song ◽  
Mingshu Wu ◽  
Guangying Chen ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Free Radical ◽  
Free Radical Photopolymerization ◽  
Silk Peptide
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