East China Normal University, Shanghai, 200241, China.
Macromol Rapid Commun. 2018 May;39(10):e1800018. doi: 10.1002/marc.201800018. Epub 2018 Apr 20.
Supramolecular hydrogels that are assembled through dynamic host-guest interactions have presented apparent potential in the construction of materials with promising performance. Herein, a photoregulated hydrogel cross-linked by host-guest interactions with multifunctions of high stretchability, strong toughness, and rapid self-healing property is reported. The hydrogel exhibits unique light-responsive property due to the introduction of two photoisomerized groups. For example, the stress-strain curve of the original hydrogel indicates 1020% rupture strain with the maximum tensile strain value of 214 kPa. Upon 365 nm light irradiation for an hour, its tensile strain increases to 15 times with lower tensile stress indicating a better stretchability. Moreover, the hydrogel is photochromic and surface patternable, where it can reversibly switch color between luminous yellow and brown while exposed to 365 and 440 nm light irradiation. It holds great promise for applying in self-recovering optically controlled and labeled elastic mechanical materials.
通过动态主体-客体相互作用组装的超分子水凝胶在构建具有优异性能的材料方面表现出了明显的潜力。本文报道了一种通过主客体相互作用交联的光调控水凝胶，其具有高拉伸性、强韧性和快速自修复性能等多种功能。由于引入了两个光致异构基团，水凝胶表现出独特的光响应特性。例如，原始水凝胶的应力-应变曲线表明断裂应变高达 1020%，最大拉伸应变值为 214 kPa。经过 365nm 光照射一小时后，其拉伸应变增加到 15 倍，拉伸应力降低，表明拉伸性能更好。此外，水凝胶具有光致变色和表面可图案化的特性，在暴露于 365nm 和 440nm 光照射时，可以在亮黄色和棕色之间可逆切换颜色。它有望应用于自恢复光控和标记弹性力学材料。
