Narrow response temperature range with excellent reversible shape memory effect for semi-crystalline networks as soft actuators

Chi, Dequan; Gu, Haoyu; Wang, Jingfeng; Wu, Chao; Wang, Ruijie; Cheng, Zhongjun; Zhang, Dongjie; Xie, Zhiyuan; Liu, Yuyan

doi:10.1039/d3mh00270e

Mater. Horiz.

2023

DOI: 10.1039/d3mh00270e

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Narrow response temperature range with excellent reversible shape memory effect for semi-crystalline networks as soft actuators

Dequan Chi

Haoyu Gu

Jingfeng Wang

et al.

Abstract: Complex and controlled reversible actuation inevitably relies on changing thermal fields (direct or indirect) for semicrystalline reversible shape memory networks. Unfortunately, the non-tunability of thermal signals often brings potential limitations...

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Cited by 3 publications

References 55 publications

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Ultrafast Biomimetic Untethered Soft Actuators with Bone‐In‐Flesh Constructs Actuated by Magnetic Field

Yue,

Xu,

Sui

et al. 2024

Adv Funct Materials

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Soft actuators with unique mechanics have gained significant interests for unique capabilities and versatile applications. However, their actuation mechanisms (usually driven by light, heat, or chemical reactions) result in long actuation times. Reported magnetically actuated soft actuators can produce rapid and precise motions, yet their complex manufacturing processes may constrain their range of applications. Here, the “bone‐in‐flesh” is proposed that constructs combining rigid magnetic structures encapsulated within soft polymers to create untethered magnetic soft actuators. This approach enables these soft, impact‐resistant, agile actuators with a significantly simplified fabrication process. As demonstration examples, multiple soft actuators are fabricated and tested, including actuators for auxetic properties, 2D–3D transformations, and multi‐stable states. As such, this work offers a promising solution to challenges associated with soft actuators to potentially expand their applications in various domains.

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Ultrafast Biomimetic Untethered Soft Actuators with Bone‐In‐Flesh Constructs Actuated by Magnetic Field

Yue,

Xu,

Sui

et al. 2024

Adv Funct Materials

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Solvent Content Controlling Strategy for Cocrystallizable Polyesters Enables a Stress‐Free Two‐Way Shape Memory Effect with Wider Service Temperatures

Guo,

Zhang,

Ruan

et al. 2023

Macromol. Rapid Commun.

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AbstractIt is challenging to enhance the stress‐free two‐way shape memory (stress‐free TWSM) effect to obtain a wide range of response temperatures. Herein, a polycaprolactone (PCL)/poly(ω‐Pentadecalactone) (PPDL) was photocured under UV light irradiation in the solvent of 1,1,2‐trichloroethane (TCA), to obtain a series of cross‐linked polyesters (CPES). Controlling solvent content (SC) which was removed after the polymerization allows the yielded CPES to perform a regulatable thermodynamic and stress‐free TWSM properties. High SC is beneficial to reduce the degree of chain overlap (C/C*) of PPDL chain segments in the PCL‐based CPES network, then causes the co‐crystallization of PCL and PPDL and yielding an additional melting‐transitions (Tm). An enhanced stress‐free TWSM was obtained in high SC samples (CPES‐15‐90), reflected in the attainment of a wide range of response temperature, which mean a wider service temperature. The enhancement is reflected in higher reversible strain of high SC samples compared with the samples prepared with low SC when varying high trigger temperature (Thigh). Even at high Thigh, the High SC sample still has reversible strain. Therefore, controlling solvent content strategy for photocuring co‐polyester not only provides a new preparation approach for high‐performance SM polymers, but also offers new condensed polymer structure to explore.This article is protected by copyright. All rights reserved

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Bio-Inspired Hydrogel–Elastomer Actuator with Bidirectional Bending and Dynamic Structural Color

Xia,

Meng,

et al. 2023

Molecules

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In nature, some creatures can change their body shapes and surface colors simultaneously to respond to the external environments, which greatly inspired researchers in the development of color-tunable soft actuators. In this work, we present a facile method to prepare a smart hydrogel actuator that can bend bidirectionally and change color simultaneously, just like an octopus. The actuator is fabricated by elastomer/hydrogel bilayer and the hydrogel layer was decorated with thermoresponsive microgels as the photonic crystal blocks. Compared with the previously reported poly(N-isopropylacrylamide) hydrogel-based bilayer hydrogel actuators, which are generally limited to one-directional deformation, the elastomer/hydrogel bilayer actuator prepared in our work exhibits unique bidirectional bending behavior in accordance with the change of structural color. The bending degrees can be changed from −360° to 270° in response to solution temperatures ranging from 20 °C to 60 °C. At the same time, the surface color changes from red to green, and then to blue, covering the full visible light spectrum. The bending direction and degree of the hydrogel actuator can easily be adjusted by tuning the layer thickness ratio of the elastomer/hydrogel or the composition of the hydrogel. The color-tunable hydrogel-elastomer actuator reported in this work can achieve both programmable deformations and color-changing highly resembling the natural actuating behaviors of creatures.

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Narrow response temperature range with excellent reversible shape memory effect for semi-crystalline networks as soft actuators

Abstract: Complex and controlled reversible actuation inevitably relies on changing thermal fields (direct or indirect) for semicrystalline reversible shape memory networks. Unfortunately, the non-tunability of thermal signals often brings potential limitations...

Cited by 3 publications

References 55 publications

Ultrafast Biomimetic Untethered Soft Actuators with Bone‐In‐Flesh Constructs Actuated by Magnetic Field

Ultrafast Biomimetic Untethered Soft Actuators with Bone‐In‐Flesh Constructs Actuated by Magnetic Field

Solvent Content Controlling Strategy for Cocrystallizable Polyesters Enables a Stress‐Free Two‐Way Shape Memory Effect with Wider Service Temperatures

Bio-Inspired Hydrogel–Elastomer Actuator with Bidirectional Bending and Dynamic Structural Color

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