Synthesis and properties of novel bis-chalcone-based photoinitiators for LED polymerization with photobleaching and low migration

Photopolymerization using bio-sourced photoinitiators

“…In the same year, Qu's group developed six bis-chalcones as PIs ( C138–C143 ) and explored the effects of various polycyclic aromatic hydrocarbon (PAH) structures and the unsaturated units on the wavelength of max absorption, solubility, and migration capabilities of C138–C143 . 123 The results showed that the absorption wavelengths gradually redshifted to the blue light area as the number of aromatic rings increased from C138 to C141 and unsaturated bonds were grafted into the molecular structures of C142 to C143 , with the wavelengths of maximal absorption of C141 and C143 at 442 nm and 395 nm, respectively. Except that, C142 and C143 might successfully address the issue of low solubility.…”

“…9 The chemical structures of bis-chalcones photoinitiators (C71-C143). [113][114][115][116][117][118][119][120][121][122][123] Review Polymer Chemistry light-induced polymerization. The molar extinction coefficient of anthracenyl chalcone at 405 nm conversely is lowered when compared to dimethylaminophenyl chalcone.…”

Synthesis of One‐Component Type II Visible‐Light‐Absorbing Chalcones Containing Fused Aromatic Rings and Investigation of Free Radical Photopolymerization Properties

“…Thus, this kinds of photoinitiating systems can effectively initiate free radical photopolymerization upon longer light irradiations. [28] Compared to bis-chalcone, nevertheless, asymmetrical monochalcone is more flexible on the structural modifications. No matter what types of the chalcones, their photoinitiating systems suffer from a main drawback that requiring the additive of hydrogen donors.…”

“…For Type II photoinitiators systems, chalcone-based compound was classified as a promising hydrogen acceptor photoinitiator due to the facile synthetic procedures and long absorption wavelengths. [19][20][21] For further boarding the light absorption regions of the chalcone, different chromophores such as triphenylamine, [22][23][24] carbazole, [22,25] phenothiazine, [26] aromatic ring, [27,28] heterocyclic structures [29] had been introduced by the researchers. Furthermore, symmetrical bis-chalcones combine two chromophores extended conjugation length more significantly, which were beneficial for the light harvesting.…”

New long-wavelength D–π-A–π-D chalcone photoinitiator for visible light polymerization with photobleaching and biocompatibility properties

“…32 In our previous studies, we synthesized two phenothiazine photoinitiators with a maximum absorption wavelength of 440 nm. 33 On a similar basis, in this work, two kinds of triphenylamine photoinitiators and two kinds of fluorene photo-initiators were synthesized as free radical photoinitiators. In the presence of LED illumination and sunlight, the photoinitiation activity of trimethylolpropane triacrylate (TMPTA) polymerization was studied and the optical, electrochemical, and theoretical properties were investigated.…”