光致聚合物
光化学
吡啶
聚合
可见光谱
材料科学
聚合物
单体
飞秒
化学
激光器
光电子学
有机化学
光学
物理
复合材料
作者
Qiang Ma,Loïc Buchon,Valentin Magné,Bernadette Graff,Fabrice Morlet‐Savary,Yangyang Xu,Mahmoud Benltifa,Sami Lakhdar,Jacques Lalevée
标识
DOI:10.1002/marc.202200314
摘要
In both organic and polymer synthesis, photochemistry of charge transfer complexes (CTCs) is considered as a powerful approach to expand visible-light-driven radical chemistry reaction. One reports herein on the development of a class of useful CTCs using pyridinium salts as efficient electron acceptors (combined with N, N, 3,5-tetramethylaniline, TMA) to achieve a multiwavelength (375-560 nm) metal-free LED photopolymerization process under mild conditions (open to air, without monomer purification and inhibitor removal). The UV-vis absorption spectra and molecular modeling simultaneously verify its potential blue-green absorbing wavelength range. Also, their good thermal initiation behavior at relatively low temperatures makes it easier to achieve thick samples and/or polymerization in the shadow region in practice. More importantly, with excellent photoinitiating capability, the formulation is successfully applied to direct laser write (DLW) and high-resolution 3D printing, yielding a series of objects with well-defined structures, such as letters, ring, solid squares, and chess pieces. These new pyridinium salt acceptors further extend the applicability to visible photopolymerizable resins and additive-containing formulations for efficient surface and deep curing.
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