探索芳基硫代甲酸酯作为光引发剂。

Exploring Aromatic -Thioformates as Photoinitiators.

作者信息

Rieger Paul, Pueschmann Sabrina, Haas Michael, Schmallegger Max, Guedes de la Cruz Gema, Griesser Thomas

机构信息

Institute of Chemistry of Polymeric Materials, Montanuniversität Leoben, Otto Glöckelstrasse 2, 8700 Leoben, Austria.

Institute of Inorganic Chemistry, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria.

出版信息

Polymers (Basel). 2023 Mar 26;15(7):1647. doi: 10.3390/polym15071647.

DOI:10.3390/polym15071647

PMID:37050262

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10097006/

Abstract

Thiyl radicals were generated from aromatic -thioformates by photolysis. The corresponding photo-initiated decarbonylation allows initiating polymerization reactions in both acrylate- and thiol-acrylate-based resin systems. Compared to aromatic thiols, the introduction of the photolabile formyl group prevents undesired reactions with acrylate monomers allowing photoinitiators (PIs) with constant reactivity over storage. To demonstrate the potential of -thioformates as PIs, the bifunctional molecule -(thiobis(4,1-phenylene))dimethanethioate () was synthesized, providing reactivity under visible light excitation. Consequently, acrylate-based formulations could successfully be processed by digital light processing (DLP)-based stereolithography at 405 nm in high resolution.

摘要

通过光解从芳族硫代甲酸酯生成硫自由基。相应的光引发脱羰反应能够引发丙烯酸酯基和硫醇-丙烯酸酯基树脂体系中的聚合反应。与芳族硫醇相比，引入光不稳定的甲酰基可防止与丙烯酸酯单体发生不期望的反应，从而使光引发剂（PI）在储存期间具有恒定的反应活性。为了证明硫代甲酸酯作为光引发剂的潜力，合成了双功能分子 -（硫代双（4,1-亚苯基））二甲硫代酸酯（），其在可见光激发下具有反应活性。因此，基于丙烯酸酯的配方可以在405 nm下通过基于数字光处理（DLP）的立体光刻技术以高分辨率成功加工。