Photobleachable cinnamoyl dyes for radical visible photoinitiators

Liao, Wen; Xu, Can; Wu, Xiang; Liao, Qiuyan; Xiong, Ying; Li, Zhen; Tang, Hongding

doi:10.1016/j.dyepig.2020.108350

Cited by 29 publications

(21 citation statements)

References 50 publications

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“…A six‐line EPR spectrum was obtained and a simulation of the corresponding spectrum leads to nitrogen and hydrogen hyperfine coupling constants of 14.9 and 3.0 G, respectively. It was slightly different from the known data for α ‐aminoalkyl radicals, [ 41,42 ] and this could be the substituent effect. It was in agreement with the literature data [ 43,44 ] and revealed the presence of carbon‐based radicals.…”

Section: Resultscontrasting

confidence: 91%

Photophysical/Photochemical, Kinetic, and Migration Stability Studies of One‐Component Polymerizable Thioxanthone‐Based Photoinitiators

Zhang

et al. 2021

Macro Chemistry & Physics

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Herein, N‐benzyl‐N‐(9‐oxo‐9H‐thioxanthen‐2‐yl)acrylamide (TXNBA) is designed and synthesized as one‐component polymerizable photoinitiator (PI). It is investigated in terms of its photophysical/photochemical, kinetic, and migration stability properties by ultraviolet‐visible spectrophotometer, Fourier transform infrared spectrometer, and EPR spin trapping experiments. In conjunction with the experimental studies, series of density functional theory calculations are performed and various photophysical and photochemical properties are computationally calculated and visualized. The photolysis and photoinitiation mechanism of TXNBA is clarified. Comparison of the results of 2‐isopropylthioxanthone (ITX) system has shown that TXNBA is an efficient one‐component polymerizable PI with excellent migration stability. The photoinitiator's migration ratio of TXNBA system to ITX system is 8.52%.

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Section: Resultscontrasting

confidence: 91%

Photophysical/Photochemical, Kinetic, and Migration Stability Studies of One‐Component Polymerizable Thioxanthone‐Based Photoinitiators

Zhang

et al. 2021

Macro Chemistry & Physics

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“…Free-radical photopolymerization is an example of a classic photochemical chain reaction in three main stages: initiation, propagation, and termination, which leads to the formation of oligomers or polymers [79,80]. Depending on the structure of a radical photoinitiator, free radicals may be formed in the process of homolytic photodissociation of the photoinitiator molecule -type I photoinitiators.…”

Section: Types Of Photoinitiators For Photopolymerization Processesmentioning

confidence: 99%

Water-Soluble Photoinitiators in Biomedical Applications

2020

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Light-initiated polymerization processes are currently an important tool in various industrial fields. The advancement of technology has resulted in the use of photopolymerization in various biomedical applications, such as the production of 3D hydrogel structures, the encapsulation of cells, and in drug delivery systems. The use of photopolymerization processes requires an appropriate initiating system that, in biomedical applications, must meet additional criteria such as high water solubility, non-toxicity to cells, and compatibility with visible low-power light sources. This article is a literature review on those compounds that act as photoinitiators of photopolymerization processes in biomedical applications. The division of initiators according to the method of photoinitiation was described and the related mechanisms were discussed. Examples from each group of photoinitiators are presented, and their benefits, limitations, and applications are outlined.

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“…Organic dyes are characterized by appealing features such as high molar extinction coefficients, good light absorption properties over the visible range (mostly in the 400-700 nm range), and high photochemical stability. [42][43][44][45][46][47][48][49][50] Even if numerous dyes have already been investigated in photopolymerization, the development of highly reactive PISs capable to efficiently initiate the free radical/cationic polymerization under mild irradiation conditions (low light intensity and under air) is still a challenge.…”

Section: Introductionmentioning

confidence: 99%

Organic dye‐based photoinitiating systems for visible‐light‐induced photopolymerization

Sun

Xiao

Dumur

et al. 2021

Journal of Polymer Science

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Even though many organic dyes have been reported as photoinitiators/photosensitizers for free radical polymerization in the literature, the design and development of novel photoinitiating systems based on organic dyes adaptable for visible light irradiation, for example, 405 nm LED and sunlight still remains challenging. Recently, major achievements in the development of high‐performance photoinitiating systems based on organic dyes as light‐harvesting compounds and their uses as photoinitiators for photopolymerization under visible‐light irradiation have clearly emerged, giving rise to abundant literature. In this review, an overview of the recently synthesized chromophores belonging to various families of organic dyes and used as photoinitiators of polymerization during the 2018–2021 period are presented and classified. Recent works have resulted in the development of new chromophores exhibiting remarkable visible light absorption properties and excellent photoinitiation abilities upon irradiation with LEDs and/or sunlight in free radical photopolymerization processes. These developments notably indicate that sunlight has the advantages of being a cheap, unlimited, broad emission spectrum, and energy‐saving light source capable to be an efficient substitute to artificial light sources. The newly developed dye‐based photoinitiating systems designed to initiate visible‐light‐induced photopolymerization processes are likely to expand the scope of application of photopolymerization in modern sciences and technologies.

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Photobleachable cinnamoyl dyes for radical visible photoinitiators

Cited by 29 publications

References 50 publications

Photophysical/Photochemical, Kinetic, and Migration Stability Studies of One‐Component Polymerizable Thioxanthone‐Based Photoinitiators

Photophysical/Photochemical, Kinetic, and Migration Stability Studies of One‐Component Polymerizable Thioxanthone‐Based Photoinitiators

Water-Soluble Photoinitiators in Biomedical Applications

Organic dye‐based photoinitiating systems for visible‐light‐induced photopolymerization

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