DYES AND PIGMENTS
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2020
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IF 4.613
Wen Liao,Can Xu,Xiang Wu,Qiuyan Liao,Ying Xiong,Zhen Li,Hongding Tang
Three new photobleachable cinnamoyl dyes for radical visible photoinitiators (CAs) were prepared by aldol condensation reaction of 2, 4-bis(diethylamino) benzaldehyde and esters (including ethyl acetate, diethyl malonate and ditertbutyl malonate), in comparison with CAs, the ditertbutyl 2-(4-(diphenylamino)benzylidene) malonate (TA) was also prepared. Their structures were confirmed by 1 H NMR, 13 C NMR, HR-MS. The mechanisms of the radicals generated from CAs and TA were proposed through electron paramagnetic resonance (EPR) analysis and steady state photolysis experiments. The investigated CAs and TA can effectively initiate the photopolymerization of 1, 6-hexanediol diacrylate (HDDA) under LED@405 nm exposure. Among these photoinitiators, CA-2 showed the best visible light photoinitiating efficiency and photobleachable characteristic. Furthermore, the residual initiators in cured HDDA polymers were proved to be as low as 0.243% and the obtained colorless polymer was up to 2.8 mm thickness when CA-2 was employed as the photoinitiator. These efficient photobleachable visible initiators show great potentials in deep curing materials.
研究领域:
材料科学
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化学工程
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高分子化学
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2021
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IF 5.161
Xiaobing Ju,Xiuyuan Hu,Yanjing Gao,Jun Nie,Fang Sun
This work reports two hydrogen donor-containing naphthalimide benzyl thioether photoinitiators (NBT-HD1 and NBT-HD2), combining characters of one-component and two-component photoinitiators, for LED photopolymerization . They have good absorptions at emission wavelengths of LED and their ɛ max are more than or close to 1 × 10 4 M −1 cm −1 . Both photoinitiators can generate radicals having initiating ability through not only the cleavage of C S bonds, but also intermolecular hydrogen abstractions themselves under 405 nm LED irradiation. NBT-HD2 with acryloyl group presents an excellent capability of reducing oxygen inhibition. Moreover, NBT-HD1 or NBT-HD2/iodonium salt can trigger the cationic photopolymerization of the epoxide under 405 nm LED irradiation. More significantly, NBT-HD2 with acryloyl group exhibits a prominent migration stability in the polymer film and has broad application prospects in the field of food packaging and biomaterials.
研究领域:
材料科学
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化学工程
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2022
·
IF 6.206
Yinping Wu,Changxiang Dai,Jiasheng Ke,Rui Tang,Chenguang Huang,Jiuwu Wang,Yue Situ,Hong Huang
Three type I radical photoinitiators (BTPO-1–BTPO-3) containing two acylphosphine oxide structures were designed and synthesized for UV-LED photopolymerization . Three kinds of substituents with different lengths of ethoxy chains were introduced into the molecular structure to form a bisacylphosphine oxide photoinitiator. The effects of different lengths of glycols on the performance of bisacylphosphine oxide photoinitiators were explained by UV–vis absorption spectra , photopolymerization properties, steady-state photolysis, solubility in monomers , and mobility. All of the three new photoinitiators BTPO-1/BTPO-2/BTPO-3 not only possess good solubility in acrylate monomers and excellent photopolymerization properties, but also their mobility in cured films is undetectable by extraction method and UV–Vis spectrum technology. Compared with the mobility of conventional commercial photoinitiator TPO-L (0.98 %), the high molecular weight bisacylphosphine oxides show higher migration stability and environmental friendliness. The results show that the novel bisacylphenylphosphine oxide BTPO-1/BTPO-2/BTPO-3 have great potentials as type I free radical photoinitiator for LED light-curing technology in food packaging and biomedical materials fields.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2022
·
IF 6.206
Zhaoxian Tang,Yanjing Gao,Shengling Jiang,Jun Nie,Fang Sun
In this work, four ethyl cinnamoylformate derivatives photoinitiators (ECFs), which have good photobleaching ability and excellent cytocompatibility in LED-triggered photopolymerization , were designed and synthesized by a simple two-step reaction. The potential initiating and photobleaching mechanisms of ECFs under visible LED were researched by ultraviolet−visible absorption spectroscopy , nuclear magnetic resonance, high−resolution mass spectroscopy and electron spin resonance . The as-prepared photoinitiators ethyl p-methoxycinnamoyl formate (O-ECF) and ethyl p -methylmercaptocinnamoyl formate (S-ECF) exhibited much higher initiating rate under 405 nm and 455 nm LED compared to the commercial photoinitiator 2-isopropylthioxanthone (ITX). More significantly, carbon‑carbon double bonds of ECFs can polymerize in the presence of tertiary amine under the irradiation of 455 nm or 405 nm LED, which endows ECFs with good photobleaching performance and excellent migration stability and cytocompatibility. Furthermore, ECFs are able to greatly initiate deep-layer photopolymerization under 455 nm LED and the photopolymerization depth reached 7.0 cm after the irradiation for 20 min. This work also affords a new perspective for designing photoinitiators with good photobleaching performance.
研究领域:
材料科学
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化学
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高分子科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
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2024
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IF 4.1
Weifeng Ma,Wei Jia,Yanjing Gao,Fang Sun
In this study, we designed and synthesized four α-ketone aryl thioesters photoinitiators ( PTEs ) with excellent cytocompatibility for LED photopolymerization using a simple one-step reaction. We investigated the potential photopolymerization initiation mechanisms of PTEs under 405 nm LED irradiation through ultraviolet–visible absorption spectroscopy, high-resolution mass spectroscopy, and electron spin resonance. Our findings revealed that PTEs can effectively initiate the photopolymerization of acrylate monomer tripropylene glycol diacrylate (TPGDA) under either 405 nm or 455 nm LED irradiation, achieving double bond conversions of approximately 80 % or higher after 180 s of irradiation. Remarkably, compared to the commercial photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO) and benzoyl methacrylate (MBF), PTEs exhibit certain advantage in initiating photopolymerization of triethylene glycol dimethacrylate (TEGDMA) widely used for dental materials under the irradiation of 405 nm. More importantly, MO-PTE has better cytocompatibility compared to TPO and exhibits a great potential in the fields of LED photopolymerization, biomaterials and food packaging.
研究领域:
材料科学
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高分子化学
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生物医学工程
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牙科材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）