Solid-state and liquid-free stretchable ionic conductors are highly desirable for stretchable electronics, because the ion-conductive hydrogels and ionogels suffer from potential solvent evaporation and leakage, respectively. Herein, we report a highly stretchable, resilient and liquid-free ion-conductive elastomer, which is further exploited as a stretchable, pressure-independent touch sensor. The liquid-free ion-conductive elastomer is reasonably designed by simultaneously incorporating highly flexible ethoxy chains and hydrogen-bonding sites into the main chains of the imidazole-based polymeric ionic liquid (PIL). The hydrogen-bond cross-linking significantly enhances the mechanical strength and resilience of the PIL-based elastomer despite maintaining a very low glass transition temperature. As a result, the solid-state and liquid-free ion-conductive elastomer possesses an ionic conductivity as high as ca. 0.131 mS cm⁻¹ at room temperature, a satisfactory tensile strength of ca. 0.24 MPa and a high elongation-at-break of ca. 540%. Importantly, the ion-conductive elastomer exhibits an autonomous self-healing behavior at room temperature, making the cut sample easily recover its original mechanical performance and ionic conductivity. Electrical impedance-based stretchable touch sensors can be fabricated by simply incorporating the ion-conductive elastomer into the alternating current circuit. The touch sensor can accurately sense human touch regardless of being stretched or not. Because of the self-healing property, the stretchable touch sensor can easily restore its sensing performance even after break. The as-developed touch sensor shows high promise for application in human–machine interfaces of soft and stretchable electronics.

中文翻译：

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具有自主自我修复能力的固态和无液态弹性体离子导体

固态和无液体的可拉伸离子导体对于可拉伸电子器件是非常需要的，因为离子导电水凝胶和离子凝胶分别遭受潜在的溶剂蒸发和泄漏的困扰。在此，我们报道了一种高度可拉伸，有弹性且无液体的离子导电弹性体，该弹性体被进一步用作可拉伸，独立于压力的触摸传感器。通过将高度柔性的乙氧基链和氢键合位点同时引入到基于咪唑的聚合物离子液体（PIL）的主链中，合理设计了无液体离子导电弹性体。尽管保持非常低的玻璃化转变温度，但氢键交联显着提高了PIL基弹性体的机械强度和回弹力。结果是，ca. 室温下为0.131 mS cm ^-1，令人满意的拉伸强度约为 0.24 MPa和高断裂伸长率ca540％。重要的是，离子导电弹性体在室温下表现出自主的自我修复行为，使切割后的样品易于恢复其原始机械性能和离子电导率。基于电阻抗的可拉伸触摸传感器可以通过将离子导电弹性体简单地并入交流电路中来制造。不论是否被拉伸，触摸传感器都可以准确地感测人的触摸。由于具有自愈特性，即使在断裂后，可拉伸触摸传感器也可以轻松恢复其传感性能。已开发的触摸传感器在软性和可拉伸电子设备的人机界面中显示出很高的应用前景。