新型二苯甲酮光引发剂的合成及其光聚合性能

本文合成了一种新型二苯甲酮基复合光引发剂4-(2-羟基-3-叔丁基)二苯甲酮(OEBP),采用红外光谱、核磁共振氢谱对其结构进行表征。并采用实时红外光谱研究了OEBP光引发剂引发丙烯酸酯类单体的光聚合行为。结果表明,该引发剂的最大吸收光谱在280 nm,随着紫外光照的进行,OEBP的最大吸收峰280 nm逐渐减少,其变化呈线性关系。随着引发剂浓度的增加,单体的最大速率和转化率先增大后减小;随着光强的增大,单体转化率和最大聚合速率都增大。OEBP与传统的光引发剂二苯甲酮/4-二甲基氨基苯甲酸乙酯(BP/EDAB)引发效率相当。

Synthesis and photopolymerization of a novel one-component photoinitiator based on benzophenone

4-（2-hydroxy-3-ethoxy propoxy radicals） benzophenone （OEBP）, a novel photoinitiator for free radical polymerization, was synthesized and characterized. The photopolymerization kinetics of 1,6-hexanediol diacrylate （HDDA） was studied with real-time infrared spectroscopy （FT-IR）. When this photointiator was used to efficiently initiate polymerization of acrylates and methacrylates, there was an optimum cure rate with the increase in OEBP concentration. Both the polymerization rate and final conversion rate increased with the light intensity. The kinetics study of photopolymerization of HDDA showed that OEBP was more effective as a photoinitiator compared with benzophenone and benzophenone/ethyl-4-dimethylaminobenzoate （EDAB）.