Highly stretched and conductive hydrogels, especially synthetized from natural polymers, are beneficial for highly stretched electronic equipment which is applied in extreme environment. We designed and prepared robust and tough alginate hydrogels (GMA-SA-PAM) using the ingenious strategy of fully interpenetrating cross-linking, in which the glycidyl methacrylate (GMA) was used to modify sodium alginate (SA) and then copolymerized with acrylamide (AM) and methylenebisacrylamide (BIS) as cross-linkers. The complete cross-linked structures can averagely dissipate energy and the polymer structures can maintain hydrogels that are three-dimensional to greatly improve the mechanical performance of hydrogels. The GMA-SA-PAM hydrogels display ultra-stretchable (strain up to ∼407% of tensile strain) and highly compressible (∼57% of compression strain) properties. In addition, soaking the GMA-SA-PAM hydrogel in 5 wt% NaCl solution also endows the conductivity of the hydrogel (this hydrogel was named as GSP-Na) with excellent conductive properties (5.26 S m −1 ). The GSP-Na hydrogel with high stability, durability, as well as wide range extent sensor is also demonstrated by researching the electrochemical signals and showing the potential for applications in wearable and quickly responded electronics.

中文翻译：

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海藻酸盐和丙烯酰胺完全互穿的高强度导电水凝胶

高拉伸和导电的水凝胶，特别是由天然聚合物合成的水凝胶，对于在极端环境下使用的高拉伸电子设备是有益的。我们使用巧妙的全互穿交联策略设计并制备了坚固而坚韧的藻酸盐水凝胶（GMA-SA-PAM），其中甲基丙烯酸缩水甘油酯（GMA）用于修饰藻酸钠（SA），然后与丙烯酰胺（ AM）和亚甲基双丙烯酰胺（BIS）作为交联剂。完整的交联结构可以平均耗散能量，聚合物结构可以保持三维水凝胶，从而大大改善水凝胶的机械性能。GMA-SA-PAM水凝胶显示出超可拉伸的特性（最大拉伸应变约为407％）和高度可压缩的特性（压缩应变约为57％）。另外，将GMA-SA-PAM水凝胶浸泡在5重量％的NaCl溶液中还赋予水凝胶（该水凝胶被称为GSP-Na）的电导率，其具有优异的导电性能（5.26S m -1）。GSP-Na水凝胶具有高稳定性，耐用性以及宽范围传感器，还可以通过研究电化学信号来展示，并显示出在可穿戴和快速响应的电子产品中的应用潜力。