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A Conductive Self‐Healing Double Network Hydrogel with Toughness and Force Sensitivity
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2018-04-17 , DOI: 10.1002/chem.201800259
Shunli Liu 1 , Kewen Li 1 , Imtiaz Hussain 1 , Olayinka Oderinde 1 , Fang Yao 1 , Jiuyang Zhang 1 , Guodong Fu 1
Affiliation  

Mechanically tough and electrically conductive self‐healing hydrogels may have broad applications in wearable electronics, health‐monitoring systems, and smart robotics in the following years. Herein, a new design strategy is proposed to synthesize a dual physical cross‐linked polyethylene glycol/poly(acrylic acid) (PEG/PAA) double network hydrogel, consisting of ferric ion cross‐linked linear chain extensions of PEG (2,6‐pyridinedicarbonyl moieties incorporated into the PEG backbone, PEG‐H2pdca) as the first physical network and a PAA‐Fe3+ gel as the second physical network. Metal‐ion coordination and the double network structure enable the double network hydrogel to withstand up to 0.4 MPa tensile stress and 1560 % elongation at breakage; the healing efficiency reaches 96.8 % in 12 h. In addition, due to dynamic ion transfer in the network, the resulting hydrogels exhibit controllable conductivity (0.0026–0.0061 S cm−1) and stretching sensitivity. These functional self‐healing hydrogels have potential applications in electronic skin. It is envisioned that this strategy can also be employed to prepare other high‐performance, multifunctional polymers.

中文翻译:

具有韧性和力敏性的导电自修复双网络水凝胶

在接下来的几年中,具有机械韧性和导电性的自修复水凝胶可能会在可穿戴电子设备,健康监测系统和智能机器人中得到广泛应用。本文提出了一种新的设计策略,以合成由PEG(2,6-吡啶羰基部分并入PEG主链,PEG-H 2 pdca)作为第一个物理网络和PAA-Fe 3+凝胶作为第二个物理网络。金属离子配位和双网状结构使双网水凝胶可承受0.4 MPa的拉应力和1560%的断裂伸长率;12 h内治愈率达到96.8%。另外,由于网络中动态的离子转移,所得水凝胶显示出可控制的电导率(0.0026–0.0061 S cm -1)和拉伸敏感性。这些功能性自修复水凝胶在电子皮肤中具有潜在的应用。可以预见,该策略也可用于制备其他高性能,多功能聚合物。
更新日期:2018-04-17
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