Self-Healable and Recyclable Dual-Shape Memory Liquid Metal-Elastomer Composites

被引：18

作者：

Deng, Xiaobo ^{[1
]}

Chen, Guokang ^{[1
]}

Liao, Yifan ^{[2
]}

Lu, Xi ^{[1
]}

Hu, Shuangyan ^{[1
]}

Gan, Tiansheng ^{[1
]}

Handschuh-Wang, Stephan ^{[1
]}

Zhang, Xueli ^{[1
]}

机构：

[1] Shenzhen Univ, Coll Chem & Environm Engn, Shenzhen 518060, Peoples R China

[2] Shenzhen Middle Sch, Shenzhen 518001, Peoples R China

来源：

POLYMERS | 2022年 / 14卷 / 11期

基金：

中国国家自然科学基金;

关键词：

liquid metals; polyurethane elastomers; shape memory; recyclable electronics; self-healing; LIGHT;

D O I：

10.3390/polym14112259

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Liquid metal (LM)-polymer composites that combine the thermal and electrical conductivity of LMs with the shape-morphing capability of polymers are attracting a great deal of attention in the fields of reconfigurable electronics and soft robotics. However, investigation of the synergetic effect between the shape-changing properties of LMs and polymer matrices is lacking. Herein, a self-healable and recyclable dual-shape memory composite, comprising an LM (gallium) and a Diels-Alder (DA) crosslinked crystalline polyurethane (PU) elastomer, is reported. The composite exhibits a bilayer structure and achieves excellent shape programming abilities, due to the phase transitions of the LM and the crystalline PU elastomers. To demonstrate these shape-morphing abilities, a heat-triggered soft gripper, which can grasp and release objects according to the environmental temperature, is designed and built. Similarly, combining the electrical conductivity and the dual-shape memory effect of the composite, a light-controlled reconfigurable switch for a circuit is produced. In addition, due to the reversible nature of DA bonds, the composite is self-healable and recyclable. Both the LM and PU elastomer are recyclable, demonstrating the extremely high recycling efficiency (up to 96.7%) of the LM, as well as similar mechanical properties between the reprocessed elastomers and the pristine ones.

引用

页数：14

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