一种新型聚氧亚甲基纤维人造肌肉实现了稳定的驱动行为。

IF 13 2区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Small Pub Date : 2025-05-27 DOI:10.1002/smll.202502065
Weiyao Kong,Xiaowen Zhao,Lin Ye
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引用次数: 0

摘要

聚甲醛(POM)纤维人造肌肉具有优异的耐水性和耐化学性,因此构建新型聚甲醛人造肌肉对于开发先进的高稳定性柔性作动装置具有重要意义。然而,聚甲醛纤维结晶能力强,非晶态含量低,不利于其达到理想的人造肌肉驱动性能。本文将热塑性聚氨酯弹性体(TPU)与POM共混,广泛调节其结晶行为,采用熔融纺丝-热拉伸/热定型制备了POM/TPU纤维,并首次采用融合/扭转/盘绕工艺构建了基于POM纤维的芯轴盘绕AM。随着纤维拉伸比/TPU含量的增加,拉伸POM纤维的取向因子/无定形含量的增加大大增强了肌肉的致动性能。同时,通过控制合并/扭转/卷曲几何形状,进一步优化肌肉的致动性能。在14 V驱动电压/200负载重量比下,POM/ 20t -600% AM的最大收缩应变/功容量达到40.23%/34.69 J kg-1,达到典型哺乳动物骨骼肌的201%/434%。此外,POM纤维基AM在驱动过程中由于具有热稳定的取向晶体结构,表现出良好的循环驱动稳定性,在耐碱测试中,最大收缩应变保持率达到94.11%,远高于尼龙66缝纫线AM的53.56%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Novel Polyoxymethylene Fiber-Based Artificial Muscle Enabled Stable Actuating Behavior.
Due to superior water/chemical resistance, constructing novel polyoxymethylene (POM) fiber-based artificial muscles (AM) is significant for developing advanced flexible actuating devices with high stability. However, strong crystallizing ability and low amorphous content of POM fibers were disadvantageous for them to achieve ideal actuating performance as artificial muscles. Herein, thermoplastic polyurethane elastomer (TPU) was blended with POM to regulate its crystalline behavior widely, while POM/TPU fibers were prepared by melt spinning-hot drawing/heat setting, and a mandrel-coiled POM fiber-based AM was constructed for the first time by further merged/twisted/coiled processes. With increasing fiber draw ratio/TPU content, the increased orientation factors/amorphous content of stretched POM fibers substantially enhanced the actuation properties of muscles. Meanwhile, by controlling merging/twisting/coiling geometries, the actuating properties of muscles are further optimized. Under 14 V actuating voltage/200 load-to-weight ratio, the max shrinkage strain/work capacity of POM/20T-600%f AM achieve 40.23%/34.69 J kg-1, reaching 201%/434% of those of typical mammalian skeletal muscle. Moreover, POM fiber-based AM exhibit superior cyclic actuating stability due to thermal stable oriented crystalline structures of fiber during the actuating process, while in alkali resistance tests, the maximum shrinkage strain retention reach 94.11%, much higher than that of nylon 66 sewing threads AM (53.56%).
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来源期刊
Small
Small 工程技术-材料科学:综合
CiteScore
17.70
自引率
3.80%
发文量
1830
审稿时长
2.1 months
期刊介绍: Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments. With a remarkable 2022 Journal Impact Factor of 13.3 (Journal Citation Reports from Clarivate Analytics, 2023), Small remains among the top multidisciplinary journals, covering a wide range of topics at the interface of materials science, chemistry, physics, engineering, medicine, and biology. Small's readership includes biochemists, biologists, biomedical scientists, chemists, engineers, information technologists, materials scientists, physicists, and theoreticians alike.
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