Programmable and Thermally Hardening Composite Yarn Actuators with a Wide Range of Operating Temperature,Advanced Materials Technologies

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Programmable and Thermally Hardening Composite Yarn Actuators with a Wide Range of Operating Temperature
Advanced Materials Technologies ( IF 6.4 ) Pub Date : 2020-07-01 , DOI: 10.1002/admt.202000329
Ziheng Zhang ₁ , Bo Zhu ₂ , Zehua Peng ₁ , Rong Yin ₁ , Ray H. Baughman ₃ , Xiaoming Tao ₁

Affiliation

Actuators have wide applications in intelligent robots, deformable textiles, and wearable devices, wherein the fiber‐based coiled linear actuators are particularly advantageous due to their good flexibility, high stress, and strain. However, their performances have been limited by the employed materials, whose microstructures are not easily designed and controlled. This article proposes a new approach of engineered composite yarns for the actuators. It leads to novel solutions to overcome these difficulties by offering wide design options in material properties and device structures. Here, an engineering design of programmable and thermally‐hardening helical composite yarn actuators (HCYAs) with a wide range of operating temperature is exemplified. Polyimide (PI) and polydimethylsiloxane (PDMS) are selected to fabricate HCYAs, achieving tensile actuation of 20.7% under 1.2 MPa from −50 °C to 160 °C and competitive specific work (158.9 J kg^‐1, four times of natural muscle). With constant tensile deformation, PI/PDMS HCYA nearly tripled the stress from 20 °C to 100 °C. Moreover, it is surprisingly observed an unusual thermal‐hardening phenomenon that the tensile stiffness of the PI/PDMS HCYAs increases with the rise of temperature. Equipped by electrothermally powered PI/Cu/PDMS HCYAs, robotic hands and pressure‐tunable compressive bandage are demonstrated for their potential applications in robots and wearable devices.

中文翻译：

具有广泛工作温度范围的可编程和热硬化复合纱线执行器

执行器在智能机器人，可变形的纺织品和可穿戴设备中具有广泛的应用，其中基于纤维的螺旋线性执行器由于其良好的柔韧性，高应力和应变而特别具有优势。但是，它们的性能受到所用材料的限制，所用材料的微观结构不容易设计和控制。本文提出了一种用于执行器的工程复合纱线的新方法。通过在材料特性和器件结构方面提供广泛的设计选择，它带来了克服这些困难的新颖解决方案。在此，举例说明了具有广泛工作温度范围的可编程和热硬化螺旋复合纱线执行器（HCYA）的工程设计。选择聚酰亚胺（PI）和聚二甲基硅氧烷（PDMS）来制造HCYA，^‐1，是自然肌肉的四倍）。通过恒定的拉伸变形，PI / PDMS HCYA的应力从20°C到100°C几乎增加了两倍。此外，令人惊讶地观察到一种不寻常的热硬化现象，即PI / PDMS HCYA的拉伸刚度随温度的升高而增加。通过电热驱动的PI / Cu / PDMS HCYA装备，证明了机械手和压力可调式绷带在机器人和可穿戴设备中的潜在应用。

更新日期：2020-07-01

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