Nanostructured block copolymer muscles
Nanostructured block copolymer muscles
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DOI：
10.1038/s41565-022-01133-0
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发表时间：
2022-06-02
影响因子：
38.3
通讯作者：
Hickey, Robert J.
中科院分区：
文献类型：
--
作者：
Lang, Chao;Lloyd, Elisabeth C.;Hickey, Robert J.
由三嵌段共聚物制备的纳米结构纤维具有高度取向和交替的晶态和非晶态结构域，具有优异的力学性能、多触发驱动、高性能收缩和开关旋转。高性能驱动材料是机器人、假肢和智能服装发展所必需的。在这里，我们报告了一类纤维致动器，它结合了溶液相嵌段共聚物的自组装和应变编程结晶。致动器由高度排列的纳米结构组成，晶态和非晶态结构域交替，类似于哺乳动物骨骼肌的有序和条纹模式。已报道的纳米结构嵌段共聚肌肉在几个方面优于目前的致动器，包括效率(75.5%)、驱动应变(80%)和机械性能(例如，断裂应变高达900%，韧性高达121.2 MJ m(-3))。纤维表现为开/关旋转驱动，最高转速为450转/分。此外，报告的纤维显示了多触发驱动(热和水合)，提供了可切换的机械性能和各种操作模式。聚合物纤维的多功能性和可回收性，与简单的制造方法相结合，为使用嵌段共聚物制造多功能和可回收的致动器开辟了新的途径。
Nanostructured fibres with highly aligned and alternating crystalline and amorphous domains created from triblock copolymers exhibit excellent mechanical properties, multi-trigger actuation, high-performance contraction and on/off rotation.High-performance actuating materials are necessary for advances in robotics, prosthetics and smart clothing. Here we report a class of fibre actuators that combine solution-phase block copolymer self-assembly and strain-programmed crystallization. The actuators consist of highly aligned nanoscale structures with alternating crystalline and amorphous domains, resembling the ordered and striated pattern of mammalian skeletal muscle. The reported nanostructured block copolymer muscles excel in several aspects compared with current actuators, including efficiency (75.5%), actuation strain (80%) and mechanical properties (for example, strain-at-break of up to 900% and toughness of up to 121.2 MJ m(-3)). The fibres exhibit on/off rotary actuation with a peak rotational speed of 450 r.p.m. Furthermore, the reported fibres demonstrate multi-trigger actuation (heat and hydration), offering switchable mechanical properties and various operating modes. The versatility and recyclability of the polymer fibres, combined with the facile fabrication method, opens new avenues for creating multifunctional and recyclable actuators using block copolymers.