The extraction of keratin from discarded feathers for the preparation of poly (vinyl alcohol) (PVA) ionic conductive hydrogels with enhanced mechanical properties shows promise for applications in green flexible electronics. Here, we first extracted feather keratin (FK) from duck feather fibers using the lactic acid/-cysteine deep eutectic solvents. Subsequently, the composite ionic conductive hydrogel composed of FK, PVA, and CaCl was constructed by a one-pot freeze-thawing strategy. The introduction of FK resulted in a denser structure of the fabricated hydrogel, which significantly enhanced its mechanical properties, including high elongation at break of 639.3%, high breaking strength of 270 kPa, and durable fatigue resistance. Impressively, the hydrogel-based wearable strain sensor demonstrated high strain sensing sensitivity (GF = 1.26), wide strain detection range (5%–200%), fast response, and stable reliability, enabling it to accurately monitor and distinguish the difference in electrical signals generated by large and tiny human motions. This work provides a reliable method for the green extraction of FK and the design of high-performance PVA hydrogel-based flexible electrical devices.

中文翻译：

---

用于可穿戴应变传感器的具有通过低共熔溶剂提取的羽毛角蛋白的增强聚乙烯醇离子导电水凝胶

从废弃羽毛中提取角蛋白用于制备具有增强机械性能的聚（乙烯醇）（PVA）离子导电水凝胶，显示出在绿色柔性电子产品中应用的前景。在这里，我们首先使用乳酸/-半胱氨酸低共熔溶剂从鸭羽毛纤维中提取羽毛角蛋白（FK）。随后，通过一锅冻融策略构建了由FK、PVA和CaCl组成的复合离子导电水凝胶。 FK的引入使得所制备的水凝胶结构更加致密，从而显着增强了其机械性能，包括639.3%的高断裂伸长率、270 kPa的高断裂强度和持久的抗疲劳性。令人印象深刻的是，基于水凝胶的可穿戴应变传感器表现出高应变传感灵敏度（GF = 1.26）、宽应变检测范围（5%–200%）、快速响应和稳定的可靠性，使其能够准确监测和区分电学差异。由大大小小的人体运动产生的信号。该工作为FK的绿色提取和基于PVA水凝胶的高性能柔性电子器件的设计提供了可靠的方法。