Adhesive hydrogels offer an appealing way to the demand for flexible epidermal electronics. Despite the significant advances of adhesive hydrogel electronics, the unavoidable degradation of adhesion and associated diminished detection on sweaty skin are two long-standing bottlenecks for their practical applications. Herein, we present a sweat-adaptive adhesive poly(acrylamide)/cellulose (PAAm/Cel) hydrogel electronic via dynamic hydrogen bond networks. Increased sweat promotes the decoupling of hydrogen bonds within the hydrogel between PAAm and cellulose, leading to enhanced skin-hydrogel interfacial adhesion due to the strong binding of exposed abundant polar groups to the skin. The resulting PAAm/Cel hydrogel exhibits robust bioadhesion on sweating skin, with 268.3 J m in interfacial toughness, 201.7 kPa in tensile strength, and 31.7 kPa in shear strength. Furthermore, the conformable and adhesive PAAm/Cel hydrogel electronics are demonstrated to produce high-quality and stable electromyogram (EMG) signals worked on persistent sweating skin. We believe that our designed adhesive hydrogel with dynamic hydrogen bond networks coupled with sweat is promising for tough bioadhesive electronics and enables bioadhesive technologies with high-level adaptivity in daily activities.

中文翻译：

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由动态氢键网络实现的汗液适应性粘合水凝胶电子器件


粘合水凝胶为满足柔性表皮电子产品的需求提供了一种有吸引力的方式。尽管粘性水凝胶电子器件取得了显着进步，但不可避免的粘附力下降和对出汗皮肤的检测能力下降是其实际应用的两个长期瓶颈。在此，我们通过动态氢键网络提出了一种汗液适应性粘合聚（丙烯酰胺）/纤维素（PAAm/Cel）水凝胶电子。出汗量的增加促进了 PAAm 和纤维素之间的水凝胶内氢键的解偶联，由于暴露的丰富极性基团与皮肤的牢固结合，导致皮肤-水凝胶界面粘附力增强。所得的 PAAm/Cel 水凝胶在出汗的皮肤上表现出强大的生物粘附性，界面韧性为 268.3 J m，拉伸强度为 201.7 kPa，剪切强度为 31.7 kPa。此外，经证明，舒适且具有粘性的 PAAm/Cel 水凝胶电子器件可以在持续出汗的皮肤上产生高质量且稳定的肌电图 (EMG) 信号。我们相信，我们设计的具有动态氢键网络和汗液的粘合水凝胶有望用于坚固的生物粘附电子产品，并使生物粘附技术在日常活动中具有高水平的适应性。