Material assembly from collective action of shape-changing polymers
Material assembly from collective action of shape-changing polymers
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DOI：
10.1038/s41563-023-01761-4
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发表时间：
2024-01
期刊：
影响因子：
41.2
通讯作者：
M. Abdelrahman;Robert J. Wagner;Manivannan Sivaperuman Kalairaj;Mason Zadan;Min Hee Kim;Lindy K Jang
中科院分区：
文献类型：
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作者：
M. Abdelrahman;Robert J. Wagner;Manivannan Sivaperuman Kalairaj;Mason Zadan;Min Hee Kim;Lindy K Jang
一些动物通过动态结构相互作用形成短暂的、响应性的和固体状的集合。这些集合体展示了自发自组装等紧急反应，这在合成软物质中很难实现。在这里，我们使用包括响应聚合物的形状变形单元来创建自组装的固体，调节它们的体积并按需分解。该整体由可逆弯曲或扭曲的响应性水凝胶、液晶弹性体或半结晶聚合物带组成。这些带状物的分散体机械地互锁，诱导可逆聚集。聚集的液晶弹性体条带的屈服应力比冷却分散体增加12倍，并且在加热时收缩34%。带状物的类型、浓度和形状决定了聚合，并控制了形成的固体的整体机械性能。用液态金属涂覆液晶弹性体条带产生光响应性和导电性聚集体，而在水凝胶条带上接种细胞能够自组装三维支架，为动态材料的设计提供了一个多功能平台。
Some animals form transient, responsive and solid-like ensembles through dynamic structural interactions. These ensembles demonstrate emergent responses such as spontaneous self-assembly, which are difficult to achieve in synthetic soft matter. Here we use shape-morphing units comprising responsive polymers to create solids that self-assemble, modulate their volume and disassemble on demand. The ensemble is composed of a responsive hydrogel, liquid crystal elastomer or semicrystalline polymer ribbons that reversibly bend or twist. The dispersions of these ribbons mechanically interlock, inducing reversible aggregation. The aggregated liquid crystal elastomer ribbons have a 12-fold increase in the yield stress compared with cooled dispersion and contract by 34% on heating. Ribbon type, concentration and shape dictate the aggregation and govern the global mechanical properties of the solid that forms. Coating liquid crystal elastomer ribbons with a liquid metal begets photoresponsive and electrically conductive aggregates, whereas seeding cells on hydrogel ribbons enables self-assembling three-dimensional scaffolds, providing a versatile platform for the design of dynamic materials.