National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process Engineering, Chinese Academy of Sciences Beijing 100049 P. R. China.
University of Chinese Academy of Sciences Beijing 100049 P. R. China.
ChemistryOpen. 2019 Dec 17;9(3):272-276. doi: 10.1002/open.201900295. eCollection 2020 Mar.
Camouflage and wound healing are two vital functions for cephalopods to survive from dangerous ocean risks. Inspired by these dual functions, herein, we report a new type of healable mechanochromic (HMC) material. The bifunctional HMC material consists of two tightly bonded layers. One layer is composed of polyvinyl alcohol (PVA) and titanium dioxide (TiO) for shielding. Another layer contains supramolecular hydrogen bonding polymers and fluorochromes for healing. The as-synthesized HMC material exhibits a tunable and reversible mechanochromic function due to the strain-induced surface structure of composite film. The mechanochromic function can be further restored after damage because of the incorporated healable polyurethane. The healing efficiency of the damaged HMC materials can even reach 98 % at 60 °C for 6 h. The bioinspired HMC material is expected to have potential applications in the information encryption and flexible displays.
伪装和伤口愈合是头足类动物从危险的海洋风险中生存的两个重要功能。受这两种功能的启发，本文报道了一种新型的可修复力致变色（HMC）材料。该双功能 HMC 材料由两层紧密结合而成。一层由聚醋酸乙烯酯（PVA）和二氧化钛（TiO）组成，用于屏蔽。另一层包含超分子氢键聚合物和荧光染料，用于修复。所合成的 HMC 材料由于复合膜的应变诱导表面结构而表现出可调谐且可逆的力致变色功能。由于掺入了可修复的聚氨酯，力致变色功能在损坏后可以进一步恢复。损坏的 HMC 材料的修复效率甚至在 60°C 下 6 小时内可达到 98%。这种仿生 HMC 材料有望在信息加密和柔性显示方面具有潜在的应用。
