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A Metallosupramolecular Shape-Memory Polymer with Gradient Thermal Plasticity
Author：Yang Editor：group5 Date：2017-08-18 23:26:52 Hits:1977
Solid-state plasticity by dynamic covalent bond exchange in a shape-memory polymer network bestows a permanent shape reconfiguration ability. Spatio-selective control of thermally induced plasticity may further extend the capabilities of materials into unexplored domains. However, this is difficult to achieve because of the lack of spatio-control in typical polymer network synthesis. Metal-ligand-interactions possess the high strength of covalent bonds while maintaining the dynamic reversibility of supramolecular bonds. Metallosupramolecular shape-memory polymer networks were designed and prepared, which demonstrated solid-state plasticity. The metallo-coordination-bonds within these networks permit facile tuning of the plasticity behavior across a wide range of temperature, simply by changing the metal ion. By controlling the diffusion of two different metal ions during preparation of a polymer film, a plasticity behavior with a spatial gradient was achieved, providing a unique shape-morphing versatility with potential in shape-memory devices.
This paper titled A Metallosupramolecular Shape-Memory Polymer with Gradient ThermalPlasticity (Angew. Chem. Int. Ed. 2017, 56, 12599–12602) was published in Angew. Chem. Int. Ed.
Figure 1. Design of Metallosupramolecular Networks. a) network synthesis. b) spatially gradient network.
Figure 2. Metallo-shape memory network with gradient plasticity.