Thioxanthone-benzotriazole: Initiator and stabilizer properties in one component

Sevinç, Duygu; Karasu, Feyza; Arsu, Nergis

doi:10.1016/j.jphotochem.2008.12.019

Cited by 17 publications

(7 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Thioxanthone (TX) derivatives are widely studied due to their photochemistry and their vital role in photopolymerization activity [1][2][3]. Previous studies have presented the free radical polymerization of olefinic compounds photoinitiated by TX and their derivatives, which are sensitive to the quenching of the excited triplet states that react with a hydrogen donor thereby producing an initiating radical.…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical investigation of molecular structure and conformation of the 4-isopropylthioxanthone

Corrêa

Barolli

Ribeiro

et al. 2011

Journal of Molecular Structure

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical investigation of molecular structure and conformation of the 4-isopropylthioxanthone

Corrêa

Barolli

Ribeiro

et al. 2011

Journal of Molecular Structure

View full text Add to dashboard Cite

“…Derivatives of thioxanthone were also subjected to various condensation reactions to obtain conjugated systems, for example thioxanthone-anthracene compounds were applied to initiate the polymerisation of methyl methacrylate [33][34][35]. Heterocyclic extended thioxanthones-thioxanthone linked with benzothiophene, dibenzothiophene or benzotriazole moiety-were also studied as photoinitiators for the polymerisation of methyl methacrylate in the presence of amine [36,37]. There are also many reports in the literature concerning one-component initiators based on the thioxanthone skeleton.…”

Section: Introductionmentioning

confidence: 99%

Thioxanthone Derivatives as a New Class of Organic Photocatalysts for Photopolymerisation Processes and the 3D Printing of Photocurable Resins under Visible Light

2020

View full text Add to dashboard Cite

In the present paper, novel thioxanthone-based compounds were synthesised and evaluated as a component of photoredox catalysts/photoinitiating systems for the free-radical polymerisation (FRP) of acrylates and the ring-opening cationic polymerisation (CP) of epoxy monomers. The performance of the obtained thioxanthones in two- and three-component photoinitiating systems, in combination with amines, iodonium or sulphonium salt, as well as with alkyl halide, for photopolymerisation processes upon exposure to light emitting diodes (LEDs) with a maximum emission of 405 nm and 420 nm, was investigated. The studied compounds act also as one-component free-radical photoinitiators. Fourier transform real-time infrared spectroscopy was used to monitor the kinetics of disappearance of the functional groups of the monomers during photoinitiated polymerisation. Excellent photoinitiating efficiency and high final conversions of functional groups were observed. Moreover, the influence of thioxanthone skeleton substitution on photoinitiating efficiency was discussed. The photochemical mechanism was also investigated through cyclic voltammetry. It was discovered that thioxanthone derivatives can be used as a metal-free photoredox catalyst active for both oxidative and reductive cycles. Furthermore, a photopolymerizable system based on novel thioxanthone derivatives in a stereolithography three-dimensional (3D) printing technology under visible sources of light was used. The effects of photoinitiator type system and monomer type in photoresins during 3D printing processes were explored. The outcome of this research is the development of high-performance visible photosensitive resins with improved photosensitivity obtained thanks to the development of entirely novel photoinitiating systems specifically adapted for this application.

show abstract

“…According to type II mechanism, after triplet excitation of the photoinitiator, co‐initiator molecule is responsible for the initiation of free‐radical polymerization. Furthermore, one‐component type II photoinitators have been developed and investigated in detail by several research groups . These studies have revealed that principally one‐component derivatives of thioxanthone and benzophenone photoinitators efficiently initiate the free‐radical photopolymerization through the inter or/and intramolecular hydrogen abstraction .…”

Section: Introductionmentioning

confidence: 99%

Versatile light‐responsive organogels: Evaluation of their dye releasing and photoinitiation behaviors

Dashan

Elverici

Balta

et al. 2019

J. Polym. Sci. Part A: Polym. Chem.

View full text Add to dashboard Cite

Light-responsive crosslinked structures were prepared by a straightforward quaternization strategy using chloride functional polystyrene copolymers and commercially available Michler's ketone with varying feed ratios. Resulting organogels demonstrated excellent solvent absorption and their swelling characteristics were altered by UV-light irradiation. According to scanning electron microscope images, UVilluminated samples showed an obvious photodecomposition, which enhanced their solvent uptake capacity with increase of UV exposure. Additionally, release behavior of eosin Y as a model compound was determined by UV-vis and fluorescence spectrometers. Achieved photoactive gels were also employed as the reusable heterogeneous initiators for photoinduced free-radical polymerization of methyl methacrylate.

show abstract

Thioxanthone-benzotriazole: Initiator and stabilizer properties in one component

Cited by 17 publications

References 13 publications

Experimental and theoretical investigation of molecular structure and conformation of the 4-isopropylthioxanthone

Experimental and theoretical investigation of molecular structure and conformation of the 4-isopropylthioxanthone

Thioxanthone Derivatives as a New Class of Organic Photocatalysts for Photopolymerisation Processes and the 3D Printing of Photocurable Resins under Visible Light

Versatile light‐responsive organogels: Evaluation of their dye releasing and photoinitiation behaviors

Contact Info

Product

Resources

About