硫杂蒽酮引发剂的合成及其在丙烯酸酯光聚合中的应用

Thioxanthone photoinitiators for photopolymerization of acrylatemonomers

摘要:

本研究通过在硫杂蒽酮母体中引入查尔酮结构并共价键合供氢基团,合成了两种新型单组分硫杂蒽酮衍生物光引发剂CLT1和CLT2。通过紫外-可见吸收光谱、荧光发射光谱、稳态光降解、热稳定性分析以及光聚合反应动力学等多种方法全面评估了光引发剂的性能。研究结果表明,新型光引发剂CLT1和CLT2不仅具有良好的紫外-可见光吸收能力,而且表现出优异的热稳定性和光聚合引发能力。特别地,在不同浓度下引发单体TPGDA的聚合时,CLT1和CLT2均实现超过90%的双键转化率,优于传统商用引发剂ITX体系,表现出潜在的实际应用价值。

Abstract:

In this study, two novel single-component photoinitiators (PIs) based on thioxanthone derivatives, named CLT1 and CLT2, were synthesized by covalently linking thioxanthone framework with hydrogen-donors 1,2-dimethoxybenzene and 2,3-dihydrobenzo[b][1,4]dioxine through a chalcone structure. The performance of these PIs was comprehensively evaluated using variety of methods including UV-visible absorption spectroscopy, fluorescence emission spectroscopy, steady-state photodegradation tests, thermal stability tests, and photopolymerization kinetic tests. These results indicate that the novel PIs CLT1 and CLT2 possess not only excellent UV-visible light absorption capabilities but also outstanding thermal stability and photopolymerization initiated efficiency. Particularly, CLT1 and CLT2 exhibited double-bond conversion rates exceeding 90% in the polymerization of the monomer TPGDA at various concentrations, higher than that of the commercial ITX system, exhibiting potential value in practical application.