Dynamic diselenide bond-enabled liquid crystal elastomer-based two-way shape memory aerogels with weldability and closed-loop recyclability,Smart Molecules

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Dynamic diselenide bond-enabled liquid crystal elastomer-based two-way shape memory aerogels with weldability and closed-loop recyclability
Smart Molecules Pub Date : 2023-10-12 , DOI: 10.1002/smo.20230009
Meng Wang ₁ , Jingshu Li ₁ , Hong Yang ₁

Affiliation

Two-way shape memory polymeric aerogels (2W-SMPAs), with the ability to undergo reversible shape deformation in response to external stimuli, have extensive application in diverse fields such as actuators, sensors, robotics, and other relevant domains. In this study, we introduce a novel approach for fabricating a 2W-SMPA material based on liquid crystal elastomers (LCEs) incorporating dynamic diselenide bonds. The aerogel exhibits liquid crystal phases, excellent compressibility and shape stability, and the mesogens are uniaxial-oriented along the stretching direction. By capitalizing on the dynamic diselenide bonds, the LCE-based aerogel demonstrated remarkable reprogrammability, weldability, and recyclability through thermal reorganization. The shape-programmed aerogel sample exhibits reversible shrinking deformation during the heating and cooling cycles, ultimately achieving a maximum shrinkage ratio of 26.1%. Moreover, the LCE-based aerogel's porous structure and monodomain orientation effectively enable the adsorption of the photothermal dye DR1 and facilitated the reversible photothermal-induced shape deformation when exposed to 520 nm light irradiation. These findings reveal the potential application of this innovative LCE-based aerogel material, enabled by dynamic diselenide bonds, in various areas including control devices, soft actuators, and other diverse fields.

中文翻译：

具有可焊接性和闭环可回收性的动态二硒键液晶弹性体双向形状记忆气凝胶

双向形状记忆聚合物气凝胶（2W-SMPA）具有响应外部刺激而发生可逆形状变形的能力，在执行器、传感器、机器人和其他相关领域等不同领域具有广泛的应用。在这项研究中，我们介绍了一种基于包含动态二硒键的液晶弹性体（LCE）制造 2W-SMPA 材料的新方法。该气凝胶表现出液晶相、优异的可压缩性和形状稳定性，介晶沿拉伸方向单轴取向。通过利用动态二硒键，基于 LCE 的气凝胶通过热重组表现出卓越的可重编程性、可焊接性和可回收性。形状编程的气凝胶样品在加热和冷却循环过程中表现出可逆收缩变形，最终实现26.1%的最大收缩率。此外，基于LCE的气凝胶的多孔结构和单畴取向可以有效地吸附光热染料DR1，并在暴露于520 nm光照射时促进可逆的光热诱导形状变形。这些发现揭示了这种创新的基于 LCE 的气凝胶材料（通过动态二硒化物键实现）在控制设备、软执行器和其他不同领域等各个领域的潜在应用。

更新日期：2023-10-12

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