Self-healing hydrogels as renewable materials have attracted significant attention recently. However, traditional self-healing hydrogels require a long time for self-healing and cannot be used at low temperatures. Besides, their poor biocompatibility limits the application of hydrogels. Herein, we have prepared a hydrogel composed of polyvinyl alcohol (PVA) and modified sodium alginate. Due to the dynamic recombination of borate bonds, these hydrogels show a strong self-healing ability, with the shortest self-healing time up to 15 seconds. Also, glycerin (GI) was added into the hydrogel to increase the cold resistance of the hydrogel. At −25 °C, the hydrogel still displayed good frost resistance and elasticity. NaCl and other inorganic salts were added to endow the hydrogel with good electrical conductivity. The hydrogel also had good skin-like properties and could activate the capacitive screen of an electronic device.

中文翻译：

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基于PVA和藻酸钠的具有导电和耐寒性能的快速自修复水凝胶

自愈水凝胶作为可再生材料最近引起了广泛的关注。但是，传统的自修复水凝胶需要很长时间才能实现自修复，因此不能在低温下使用。此外，它们差的生物相容性限制了水凝胶的应用。本文中，我们制备了由聚乙烯醇（PVA）和改性海藻酸钠组成的水凝胶。由于硼酸酯键的动态重组，这些水凝胶显示出强大的自我修复能力，最短的自我修复时间长达15秒。另外，将甘油（GI）添加到水凝胶中以增加水凝胶的耐寒性。在-25°C下，水凝胶仍显示出良好的抗冻性和弹性。加入NaCl和其他无机盐以赋予水凝胶良好的导电性。