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本文报道一种基于罗丹明化合物的力致变色力敏团,可用于聚合物材料的损伤探测以及新型力响应聚合物材料的开发。首先合成罗丹明化合物小分子并通过单电子转移活性自由基聚合(SET-LRP)引入到聚甲基丙烯酸甲酯大分子骨架中。聚合物溶液超声实验和固体压缩实验证明罗丹明力敏团受力发生电开环反应(力活化),引起材料颜色变化并产生荧光。超声-加热循环实验表明开环产物能够恢复到初始闭环状态并可重复操作,因而罗丹明力敏团具有可多次力活化的特性。
In this paper, a force-induced chromotropic group based on rhodamine has been reported for the detection of damage to polymer materials and the development of novel force-responsive polymer materials. First, small molecules of rhodamine compounds were synthesized and introduced into the polymethylmethacrylate macromolecular backbone by single electron transfer living radical polymerization (SET-LRP). Polymer solution ultrasonic experiments and solid compression experiments show that Rhodamine force sensitive electric ring-opening reaction (force activation), causing the material color change and produce fluorescence. Ultrasound - heating cycle experiments show that the ring-opening products can be restored to the initial closed-loop state and can be repeated, and therefore Rhodamine has multi-force activation properties.