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Symmetrically-substituted Thiazolo[5,4-d]thiazole derivatives as both photoinitiators and dyes for 3D printing under violet LED.
- Source :
-
Dyes & Pigments . Oct2022, Vol. 206, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- The outstanding photochemical properties of thiazolothiazole and its derivatives make them attractive as potential photoinitiators. Two homosubstituted thiazolo[5,4- d ]thiazole derivatives, 2,5-di(furan-2-yl)thiazolo[5,4- d ]thiazole and 2,5-di(thiophen-2-yl)thiazolo[5,4- d ]thiazole, were investigated as photoinitiators for both the free radical and the cationic polymerization upon the light irradiation from LED@410 nm. In particular, steady-state photolysis, fluorescence quenching experiments, and electron paramagnetic resonance spin-trapping techniques were used to study their photochemical mechanisms in generating active species. When coupled with one or two additives, these thiazolothiazole-based photoinitiating systems showed effective photoinitiation abilities on both the free radical and the cationic photopolymerization. Specifically, 2,5-di(furan-2-yl)thiazolo[5,4- d ]thiazole- and 2,5-di(thiophen-2-yl)thiazolo[5,4- d ]thiazole-based photoinitiating systems were found to be of similar efficiency on the free radical photopolymerization of trimethylolpropane triacrylate and the dental resin (the blend of bisphenol A glycidyl methacrylate and triethylene glycol dimethacrylate) with minor shrinkage but presented different performance in cationic photopolymerization of 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate. Moreover, the curing depth of the samples and 3D printing capability were also investigated to determine their potential applications. [Display omitted] • Thiazolothiazole derivative-based photoinitiators can initiate both free radical and cationic photopolymerization. • Different substituents in thiazolothiazole derivative-based photoinitiators can affect the depth of photocuring. • 2,5-Di(thiophene-2-yl)thiazolo [5,4-d]thiazole can be successfully applied to 3D printing. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01437208
- Volume :
- 206
- Database :
- Academic Search Index
- Journal :
- Dyes & Pigments
- Publication Type :
- Academic Journal
- Accession number :
- 158932103
- Full Text :
- https://doi.org/10.1016/j.dyepig.2022.110638