A high performance phenyl-free LED photoinitiator for cationic or hybrid photopolymerization and its application in LED cationic 3D printing,Polymer Chemistry

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A high performance phenyl-free LED photoinitiator for cationic or hybrid photopolymerization and its application in LED cationic 3D printing
Polymer Chemistry ( IF 4.1 ) Pub Date : 2020-03-25 , DOI: 10.1039/d0py00142b
Liqun Tang _{1,

2,

3,

4} , Jun Nie _{1,

2,

3,

4} , Xiaoqun Zhu _{1,

2,

3,

4}

Affiliation

In this work, a high performance LED photoinitiator, 1,3-bis(1-methyl-1H-pyrrol-2-yl)prop-2-en-1-one (BMO), without a benzene ring was synthesized through a one-step aldehyde–ketone condensation reaction. BMO has a broad absorption range and a high molar extinction coefficient from 365 to 425 nm. Interestedly, BMO can be used not only as a type II free radical photoinitiator for which the hydrogen donor can be supplied by itself or other tertiary amines, but also as a long wavelength sensitizer to sensitize diphenyliodonium photoinitiators (Iod) under a 365 nm to 425 nm LED lamp. BMO/Iod can initiate cationic and free radical photopolymerization. It also can initiate the hybrid photopolymerization efficiently. As a sensitizer to Iod, its activity in initiating cationic photopolymerization is not less than that of 2-isopropylthioxanthone (ITX). In particular, it remains highly active at a low light intensity under a LED lamp. This is very significant to the cationic photopolymerization as well as the photocuring 3D printing technique.

中文翻译：

用于阳离子或杂化光聚合的高性能无苯基LED光引发剂及其在LED阳离子3D打印中的应用

在这项工作中，一种高性能的LED光引发剂1,3-双（1-甲基-1 H通过一步醛-酮缩合反应合成了不带苯环的-吡咯-2-基）丙-2-烯-1-酮（BMO）。BMO具有较宽的吸收范围和365至425 nm的高摩尔消光系数。有趣的是，BMO不仅可以用作II型自由基光引发剂，氢供体可以由其本身或其他叔胺提供，还可以用作长波长敏化剂，以在365 nm至425的范围内敏化二苯基碘鎓光引发剂（Iod）。 nm LED灯。BMO / Iod可以引发阳离子和自由基光聚合。它还可以有效地引发杂化光聚合。作为碘的敏化剂，其引发阳离子光聚合的活性不低于2-异丙基噻吨酮（ITX）的活性。尤其是，它在LED灯下低光强度下仍保持高活性。这对于阳离子光聚合以及光固化3D打印技术非常重要。

更新日期：2020-03-25

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