Polymer hydrogel is a promising material category for designing artificial skin, drug carriers, flexible electronic equipment, and self-healing building materials, which require good high-temperature resistance. Herein, an ultrastretchable polymer hydrogel resistant to high temperature is prepared by combining molecular self-assembly and in situ polymerization techniques. Fracture strain of the as-prepared hydrogel exceeds an unexpected 62 times, based on the ionic cross-linking of the Mg-ion and amide group of polyacrylamide (PAM). PAM frameworks retain a highly active amorphous state in harsh high-temperature vacuum environments due to Mg-ion cross-linking. Amorphous PAM frameworks inhibit the growth of magnesium chloride nanocrystals, resulting in the formation of a super porous sponge structure. The special microstructure enables the material to rapidly absorb water vapor from a humid environment, thereby restoring its inherent mechanical properties. The as-prepared composite provides a research direction for the design and application of a high-temperature-resistant polymer hydrogel.

中文翻译：

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建筑防火用耐高温可拉伸水凝胶的合理设计策略

聚合物水凝胶是一种很有前景的材料类别，可用于设计需要良好耐高温性的人造皮肤、药物载体、柔性电子设备和自修复建筑材料。本文通过结合分子自组装和原位聚合技术制备了耐高温的超拉伸聚合物水凝胶。基于镁离子和聚丙烯酰胺 (PAM) 酰胺基团的离子交联，所制备的水凝胶的断裂应变超出了意想不到的 62 倍。由于镁离子交联，PAM 框架在恶劣的高温真空环境中保持高度活跃的非晶态。无定形PAM框架抑制氯化镁纳米晶体的生长，从而形成超多孔海绵结构。特殊的微观结构使材料能够快速吸收潮湿环境中的水蒸气，从而恢复其固有的机械性能。所制备的复合材料为耐高温聚合物水凝胶的设计和应用提供了研究方向。