1-(Bromoacetyl)pyrene, a novel photoinitiator for the copolymerization of styrene and methylmethacrylate

European Polymer Journal

2021

Photopolymerization is an active research field facing a revolution due to the recent availability of cheap, lightweight, compact and energy-saving light sources that constitutes light-emitting diodes (LEDs). With regards to the low light intensity delivered by these new irradiation setups, the demand for photoinitiating systems activable under low light intensity, in the visible range, and exhibiting a high reactivity even under air are actively researched.With aim at developing dyes fitting the above requirements while remaining relatively uncoloured, chalcones are one of those. In this review, an overview of the recent development concerning chalcone-based photoinitiating systems is reported. With aim at evidencing the crucial interest of this family of dyes, comparisons with benchmark photoinitiators will be presented.

Section: Figure 1 the Characteristic Features Of Photopolymerizationmentioning

confidence: 99%

Recent advances on chalcone-based photoinitiators of polymerization

Ibrahim‐Ouali

European Polymer Journal

2021

“…This specificity is notably used advantageously with photopolymerizable glues and dental adhesives. Considering that visible light photopolymerization can be activated between 400 and 800 nm, numerous dyes absorbing in the visible range have been proposed, as exemplified with acridine-1,8-diones [36][37][38], carbazoles [39][40][41][42][43][44], pyrenes [45][46][47][48][49][50], iridium complexes, [51][52][53][54][55][56][57][58][59], copper complexes [60][61][62][63][64][65][66][67][68][69][70], squaraines [71][72][73], camphorquinones [74,75], perylenes [76][77][78], iodonium salts [79][80][81], benzophenones [82]...…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in bis-Chalcone-Based Photoinitiators of Polymerization: From Mechanistic Investigations to Applications

Giacoletto

2021

Molecules

Over the past several decades, photopolymerization has become an active research field, and the ongoing efforts to develop new photoinitiating systems are supported by the different applications in which this polymerization technique is involved—including dentistry, 3D and 4D printing, adhesives, and laser writing. In the search for new structures, bis-chalcones that combine two chalcones’ moieties within a unique structure were determined as being promising photosensitizers to initiate both the free-radical polymerization of acrylates and the cationic polymerization of epoxides. In this review, an overview of the different bis-chalcones reported to date is provided. Parallel to the mechanistic investigations aiming at elucidating the polymerization mechanisms, bis-chalcones-based photoinitiating systems were used for different applications, which are detailed in this review.

“…[129] Access to azapolyacenes is also possible with pyrene, by oxidation of the adjacent aromatic rings, enabling to prepare pyrene-diones or pyrene-tetraones. [130] Historically, 1-(bromoacetyl)pyrene (Pyr_2) which is a derivative of pyrene (Pyr_1) has been extensively studied by Daswal and coworkers as a UV-photoinitiator for the copolymerization of styrene with n-butyl acrylate, [131] methyl methacrylate [132] or acrylonitrile in solution (See Figure 4). [133] In these different studies, modification of the substitution pattern of pyrene was determined as strongly influencing the reactivity of the pyrene.…”

Section: Introductionmentioning

confidence: 99%

Recent advances on pyrene-based photoinitiators of polymerization

European Polymer Journal

2020

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