Recent advances on core-extended thioxanthones as efficient photoinitiators of polymerization

European Polymer Journal, Journal Year: 2024, Volume and Issue: 206, P. 112794 - 112794

Published: Jan. 26, 2024

Language: Английский

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Ultrafast Sunlight‐Induced Polymerization: Unveiling 2‐Phenylnaphtho[2,3‐d]Thiazole‐4,9‐dione as a Unique Scaffold for High‐Speed and Precision 3D Printing

Small, Journal Year: 2024, Volume and Issue: 20(32)

Published: March 19, 2024

Abstract A series of 15 dyes based on the 2‐phenylnaphtho[2,3‐ d ]thiazole‐4,9‐dione scaffold and 1 compound 2,3‐diphenyl‐1,2,3,4‐tetrahydrobenzo[ g ]quinoxaline‐5,10‐dione are studied as photoinitiators. These compounds used in two‐ three‐component high‐performance photoinitiating systems for free radical polymerization trimethylolpropane triacrylate (TMPTA) polyethylene glycol diacrylate (PEGDA) under sunlight. Remarkably, conversion TMPTA can reach ≈60% within 20 s, while PEGDA attains a 96% 90 s. To delve into intricate chemical mechanisms governing polymerization, an array analytical techniques is employed. Specifically, UV–vis absorption fluorescence spectroscopy, steady‐state photolysis, stability experiments, quenching cyclic voltammetry, electron spin resonance trapping (ESR‐ST) collectively contribute to comprehensive understanding photochemical mechanisms. Photoinitiation capacities these determined using real‐time Fourier transformed infrared spectroscopy (RT‐FTIR). Of particular interest revelation that, owing superior initiation ability dyes, high‐resolution 3D patterns be manufactured by direct laser write (DLW) technology printing. This underscores efficient processes newly developed both artificial natural light sources, presenting avenue energy‐saving, environmentally friendly conditions.

Language: Английский

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High Photoinitiating Efficiency of Benzothioxanthene‐Based Oxime Esters in Photopolymerization via Photocleavage and/or Single Electron Transfer under Visible Light and Sunlight

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(35)

Published: June 15, 2024

In this work, six benzothioxanthene-based oxime esters were employed as photoinitiators for photopolymerization under visible light (LED) and sunlight. Their abilities to behave Type I by mean of a photocleavage mechanism but also in multicomponent photoinitiating systems with an iodonium salt (through electron transfer mechanism) both explored the different structures. Due their broad absorption spectra tailing up 600 nm, properties systematically tested excitation low-intensity LED at wavelengths 405 nm 450 nm. Additionally, parallel polymerization tests done artificial light, investigated solar displayed high reactivity France (Western Europe) even winter conditions. For best candidates i.e. most reactive structures, direct laser write experiments carried out, evidencing interest these

Language: Английский

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High Photoinitiating Efficiency of Benzothioxanthene‐based Oxime Esters in Photopolymerization via Photocleavage and/or Single Electron Transfer under Visible Light and Sunlight

Angewandte Chemie, Journal Year: 2024, Volume and Issue: 136(35)

Published: June 15, 2024

Abstract In this work, six benzothioxanthene‐based oxime esters were employed as photoinitiators for photopolymerization under visible light (LED) and sunlight. Their abilities to behave Type I by mean of a photocleavage mechanism but also in multicomponent photoinitiating systems with an iodonium salt (through electron transfer mechanism) both explored the different structures. Due their broad absorption spectra tailing up 600 nm, properties systematically tested excitation low‐intensity LED at wavelengths 405 nm 450 nm. Additionally, parallel polymerization tests done artificial light, investigated solar displayed high reactivity France (Western Europe) even winter conditions. For best candidates i.e. most reactive structures, direct laser write experiments carried out, evidencing interest these

Language: Английский

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Design of Oxime Ester Photoinitiators Based on Methoxy-Substituted Coumarin Chromophores for LED Photopolymerization and 3D Printing

ACS Applied Polymer Materials, Journal Year: 2024, Volume and Issue: 6(20), P. 12866 - 12874

Published: Oct. 7, 2024

In this study, a series of photoinitiators (PIs) were designed and synthesized based on methoxy substitution at the 6/7/8-positions coumarin chromophores, including ketone (CKs) oxime esters (COXEs). The aim was to investigate impact substituent position photosensation photoinitiation properties PIs crucial for LED photopolymerization. It observed that introduction 6-position in both Norrish type I II resulted relatively great absorption redshift efficiency coumarin-based PI. found increase with extension irradiation time 385–450 nm, characteristic can be harnessed UV-curing 3D printing applications minimize extra radiation penetration. Notably, as co-initiator, 6-COXE exhibited remarkable enhancement vertical texture resolution whiteness printed parts. These outstanding performances 6-substituted coumarin-chromophore indicate their potential application advancing photopolymerization technology, offering an approach design high-performance PIs.

Language: Английский

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Recent advances on phenothiazine-based oxime esters as visible light photoinitiators of polymerization

European Polymer Journal, Journal Year: 2023, Volume and Issue: 202, P. 112597 - 112597

Published: Nov. 18, 2023

Language: Английский

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Coumarin derivatives as amphiphilic photoinitiators for free radical and cationic Photopolymerizations with UV–Vis LED irradiation

European Polymer Journal, Journal Year: 2025, Volume and Issue: unknown, P. 113743 - 113743

Published: Jan. 1, 2025

Language: Английский

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Distance-controlled direct ink writing of titanium alloy with enhanced shape diversity and controllable porosity

Deleted Journal, Journal Year: 2025, Volume and Issue: 2(1)

Published: Feb. 4, 2025

Language: Английский

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Stereolithography 3D printing upon near-infrared photopolymerization

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160857 - 160857

Published: Feb. 1, 2025

Language: Английский

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Type I Photoinitiator Based on Sustainable Carbon Dots

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(29)

Published: April 29, 2024

Abstract Sustainable carbon dots comprising surficial oxime ester groups following homolytic bond cleavage exhibit potential as photoinitiators for traditional free radical photopolymerization. Carbon were made a solvothermal procedure from sustainable furfural available lignocellulose. Surficial aldehyde moieties reacted with hydroxylamine to the respective while reaction benzoyl chloride resulted in biobased Type I photoinitiator dot ( CD ‐ PI ). Photoinitiating ability was compared ) ethyl (2,4,6‐trimethyl benzoyl) phenyl phosphinate TPO L by real‐time FTIR UV exposure at 365 nm. Photopolymer composition based on mixture of urethane dimethacrylate UDMA and tripropylene glycol diacrylate TPGDA similar final conversion about 70 % using either CD‐PI or TPO‐L . Nevertheless, it appeared homogeneous case compositions processed , those heterogeneous shown two glass transition temperatures. Moreover, migration rate cured samples lower comparison

Language: Английский

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