基于光致脱羧的单组分可见光引发剂的合成及其光化学性能研究

Synthesis and Photochemical Properties of One-component Visible-light Photoinitiator Based on Photodecarboxylation

单组分可见光引发剂是光固化材料研发中的重要内容。本文设计并合成了一种新型的单组分可见光引发剂——2-硫杂蒽酮乙酸四苯基磷酸盐(TXP),该引发剂以硫杂蒽酮为生色团,通过光致脱羧反应产生活性自由基,进而引发聚合反应。利用核磁和高分辨率质谱对TXP的结构进行了表征;通过光解及电子自旋共振捕获等方法研究了其光致脱羧反应。光聚合动力学研究表明:在可见光源照射下,这种单组分光引发剂能高效引发巯基-烯类单体的聚合反应,具有一定的应用的前景。

One-component visible-light photoinitiators receive more attention recently.A novel photoinitiator—tetraphenylphosphonium 2-（9-oxo-9 H-thioxanthen-2-yl）acetate（TXP） was synthesized and contained thioxanthone as the chromophore,which generate radicals via photodecarboxylation reaction.The structure was characterized by ^1 HNMR,^13CNMR and HR-MS.The study on photolysis confirmed the photoinduced decarboxylation mechanism. The novel photoinitiator showed high activity in initiating thiol-ene click polymerization under visible-light LED sources,which makes the photoinitiator promising candidates for onecomponent visible-light photoinitiator.