香豆素作为强光敏剂，用于在近紫外和可见光下进行环氧-有机硅的阳离子聚合以及 3D 打印技术的应用,Molecules

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香豆素作为强光敏剂，用于在近紫外和可见光下进行环氧-有机硅的阳离子聚合以及 3D 打印技术的应用
Molecules ( IF 4.2 ) Pub Date : 2020-04-28 , DOI: 10.3390/molecules25092063
Mira Abdallah _{1,

2,

3} , Akram Hijazi ₃ , Frédéric Dumur ₄ , Jacques Lalevée _{1,

2}

Affiliation

在这项研究中，当与 4-异丙基-4'-甲基二苯基碘鎓四（五氟苯基）硼酸盐结合时，八种香豆素（香豆素 1-8）被提议作为近紫外线和蓝光敏感的光引发剂/光敏剂，用于环氧硅氧烷的阳离子聚合（CP） (IOD)。在这些香豆素中，其中的四种（香豆素 1、2、6 和 8）从未在文献中报道过，即这些结构被专门设计为在近紫外和可见光照射下充当有机硅的光引发剂。在新提出的基于香豆素的体系的存在下，实现了良好的最终反应性环氧官能团转化率 (FC) 和高聚合率 (Rp)。由环氧硅氧烷光聚合产生的聚合物可以被认为是多种应用的有吸引力的候选物，例如：弹性体、涂料、粘合剂等。本研究的目标还侧重于比较新提出的香豆素与成熟的光敏剂，即 1-氯-4-丙氧基噻吨酮 (CPTX)、9,10-二丁氧基蒽 (DBA) 或一些商业香豆素 (Com. Coum) . 作为其高性能的一个例子，新提出的香豆素还用于在 405 nm 激光二极管照射下进行激光写入实验，以开发新的阳离子 3D 打印系统。

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Coumarins as Powerful Photosensitizers for the Cationic Polymerization of Epoxy-Silicones under Near-UV and Visible Light and Applications for 3D Printing Technology

In this study, eight coumarins (coumarins 1–8) are proposed as near-UV and blue light sensitive photoinitiators/photosensitizers for the cationic polymerization (CP) of epoxysilicones when combined with 4-isopropyl-4’-methyldiphenyliodonium tetrakis(pentafluorophenyl)borate (IOD). Among these coumarins, four of them (coumarins 1, 2, 6 and 8) have never been reported in the literature, i.e., these structures have been specifically designed to act as photoinitiators for silicones upon near UV and visible irradiation. Good final reactive epoxy function conversions (FCs) and also high rates of polymerization (Rp) were achieved in the presence of the newly proposed coumarin-based systems. The polymers generated from the photopolymerization of epoxysilicones can be considered as attractive candidates for several applications such as: elastomers, coatings, adhesives, and so on. The goal of this study focuses also on the comparison of the new proposed coumarins with well-established photosensitizers i.e., 1-chloro-4-propoxythioxanthone (CPTX), 9,10-dibutoxyanthracene (DBA) or some commercial coumarins (Com. Coum). As example of their high performance, the new proposed coumarins were also used for laser write experiments upon irradiation with a laser diode at 405 nm in order to develop new cationic 3D printing systems.

更新日期：2020-04-28

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