离子液体
材料科学
离子键合
阳离子聚合
自愈
聚合物
离子
相容性(地球化学)
聚氨酯
化学工程
高分子化学
复合材料
有机化学
化学
催化作用
替代医学
病理
工程类
医学
作者
Chao Chen,Wu Bin Ying,Jia Li,Zhengyang Kong,Fenglong Li,Han Hu,Ying Tian,Do Hwan Kim,Ruoyu Zhang,Jin Zhu
标识
DOI:10.1002/adfm.202106341
摘要
Abstract Ionic skin (I‐Skin) has the advantage of feasible compatibility with biological systems. Nevertheless, developing a stable and durable ionic skin is challenging. Here, an ionic polyurethane (i‐PU) is synthesized, which is capable of self‐healing and able to lock the ionic liquids (ILs). In detail, an ionic chain extender containing an ammonium cationic group is synthesized, followed by the polymerization to obtain the target i‐PU. Through electrostatic interaction and chain diffusion, the i‐PU can be fully self‐healed at room temperature within 400 min. Afterward, low contact angle (37°) of the i‐PU against IL and the density functional theory (DFT) calculation prove their good compatibility and strong interaction, originating from the electrostatic interaction. The Raman intensity map shows the reversible process of the enrichment and restoration of ionic concentration on the i‐PU/IL surface when external pressure is applied or released, proving stable binding of ions by ionic polymer chains. Lastly, the self‐healing I‐Skin based on the i‐PU/IL is fabricated with a wide range of pressures (0–120 kPa), fast response time (32 ms), excellent antifatigue property (2% attenuation after 1000 cycles), and remarkable sensitivity (52.4 kPa –1 ).
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