Bilayer Actuator with Overload Protection on the Basis of Semicrystalline Polyurethane,Macromolecular Rapid Communications

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Bilayer Actuator with Overload Protection on the Basis of Semicrystalline Polyurethane
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2023-01-09 , DOI: 10.1002/marc.202200720
Zhuo Zhang ₁ , Sheng Mao ₂ , Xinjia Zheng ₁ , Yingchao Ma ₁ , Yonglin He ₁ , Xiaogang Zhang ₁

Affiliation

Response to external stimuli plays a significant role in the environmental adaptation of living matters and intelligent devices. Most stimulus–response systems in nature can respond to appropriate stimuli, and inhibit the response under excessive stimuli, such as excessive heat or water, which can be called overload protection. However, even though various responsive materials have been developed for different stimuli, most of them are not protective against the overload stimuli. In this work, a bilayer actuator based on semicrystalline polyurethane is designed, which can respond differently to proper stimuli and excessive stimuli, i.e., water. This actuator can bend gradually under the proper stimulation of water, but will straighten and even bend reversely with excessive stimulation. The mechanism behind the reversible and adjustable actuator with overload protection is investigated both experimentally and theoretically, and the competition between dynamic factors and thermodynamic stability in the swelling process is considered the main cause.

中文翻译：

基于半结晶聚氨酯的具有过载保护的双层执行器

对外部刺激的反应在生物体和智能设备的环境适应中起着重要作用。自然界中的大多数刺激-反应系统都能对适当的刺激作出反应，而在过热或过水等过大刺激下抑制反应，称为过载保护。然而，尽管已经为不同的刺激开发了各种响应材料，但它们中的大多数都不能防止过载刺激。在这项工作中，设计了一种基于半结晶聚氨酯的双层致动器，它可以对适当的刺激和过度的刺激（即水）做出不同的反应。这个致动器在水的适当刺激下可以逐渐弯曲，但在过度刺激下会变直甚至反向弯曲。

更新日期：2023-01-09

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