Key Laboratory of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University , Beijing 100084, China.
ACS Appl Mater Interfaces. 2017 Sep 27;9(38):33169-33175. doi: 10.1021/acsami.7b11188. Epub 2017 Sep 18.
Plasticity of thermoset polymers has been realized by introducing exchangeable bonds, and the plasticity is mostly triggered via heat or UV light. Visible light is a relatively mild trigger that has not been used to induce plasticity in polymer materials. Herein, thermoset polyurethanes (PUs) containing diselenide bonds are fabricated that possess visible light-induced plasticity along with shape memory behavior. A series of PUs with different diselenide bond contents were tested and their shape memory properties and plasticity varied. With a higher diselenide bond content, both shape memory and light-induced plasticity are achieved. By combining these two properties, reshaping the permanent shapes of the PUs is easier. Compared with heat or UV light, visible light has the advantage of spatial control. For instance, a pattern of visible light was introduced by a commercial projector to demonstrate facile reshaping of the materials. Because visible light can be introduced via various methods, PUs with visible light-induced plasticity have great potential applications.
热固性聚合物的可变形性是通过引入可交换键来实现的，这种可变形性主要通过热或紫外线触发。可见光作为一种相对温和的触发源，尚未被用于诱导聚合物材料的可变形性。本文制备了含有二硒键的热固性聚氨酯（PU），其具有可见光诱导的可变形性和形状记忆性能。测试了一系列具有不同二硒键含量的 PU，它们的形状记忆性能和可变形性有所不同。随着二硒键含量的增加，形状记忆和光诱导可变形性都得以实现。通过结合这两种特性，更容易重塑 PU 的永久形状。与热或紫外线相比，可见光具有空间控制的优势。例如，通过商业投影仪引入可见光图案，可方便地对材料进行重塑。由于可以通过多种方法引入可见光，因此具有可见光诱导可变形性的 PU 具有很大的应用潜力。
