Tissue-Mimetic Dielectric Actuators: Free-Standing, Stable, and Solvent-Free
Tissue-Mimetic Dielectric Actuators: Free-Standing, Stable, and Solvent-Free
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DOI：
10.1021/acsapm.0c00141
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发表时间：
2020-05-01
影响因子：
5
通讯作者：
Sheiko, Sergei S.
中科院分区：
文献类型：
--
作者：
Karimkhani, Vahid;Vatankhah-Varnosfaderani, Mohammad;Sheiko, Sergei S.
介电弹性体执行器 (DEA) 中臭名昭著的问题之一是机电不稳定性，导致不受控制的击穿，从而妨碍大的可逆行程。我们通过使用由聚（甲基丙烯酸甲酯）线性嵌段和聚二甲基硅氧烷刷嵌段组成的线性-瓶刷-线性三嵌段共聚物自组装的热塑性弹性体（塑性体）解决了这个问题。这些材料表现出初始柔软性和较大变形时强烈应变硬化的独特组合，这类似于生物组织的特征行为。基于塑性体的独立式 DEA 在低电场（类似于 1 V/μ m(-1)）下工作，并可实现大（5 倍）可逆行程。鉴于有机硅具有优异的热稳定性和疏水性，这些无溶剂材料是人造肌肉设计的良好候选材料，并且能够在包括人体和海洋在内的广泛环境中运行，而不会损失致动性能。
One of the notorious problems in dielectric elastomer actuators (DEAs) is electromechanical instability resulting in uncontrolled breakdown, which precludes large reversible strokes. We resolved this issue by using thermoplastic elastomers (plastomers) self-assembled from linear-bottlebrush-linear triblock copolymers composed of poly(methyl methacrylate) linear blocks and polydimethylsiloxane brush blocks. These materials demonstrate a unique combination of initial softness and intense strain-stiffening at larger deformations, which is analogous to the signature behavior of biological tissues. Plastomer-based free-standing DEAs operate at low electric fields (similar to 1 V/mu m(-1)) and enable large (5-fold) reversible strokes. Given the excellent thermal stability and hydrophobicity of silicone, these solvent-free materials are good candidates for the design of artificial muscles and are capable of operating in a broad range of environments, including the human body and ocean, without losing actuation performance.