Adhesive hydrogels show great potential for use in tissue repair, soft robotics, ionic devices, and oil and gas extraction. However, there remains a challenge in fabriacting hydrogels with direct stable adhesion and long-term stability at high temperatures. Here, drawing inspiration from the adhesive property and thermal stability of polydopamine (PDA), we propose a facile one-pot method to construct PDA-embedded hydrogel with high-stable adhesive properties across a wide temperature range of 25–90 °C. The stable adhesion performance is attributed to the synergy of multiple non-covalent interactions of PDA embedded in the hydrogel matrix and cooperation of cationic group in functional monomer (3-acrylamidopropyl) trimethylammonium chloride. This hydrogel can undergo rapid gelation process within a few hundred seconds at high temperatures and acquire favorable mechanical strength as well as long-term resistance to high temperatures. Moreover, the hydrogel is applied in proof-of-concept demonstrations as a high-temperature plugging material in an enclosed environment, which exhibits an outstanding pressure-bearing capacity of 7.6 MPa for 1 mm cracks at 90 °C, and it further forms secondary plugging region even after breakage. This study envisages that the bioinspired hydrogel, endowed with its remarkable thermal adhesion abilities, holds promising prospects for extensive utilization in high-temperature environments.

中文翻译：

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设计具有高稳定性粘附力和高温长期稳定性的聚多巴胺包埋水凝胶


粘性水凝胶在组织修复、软机器人、离子设备以及石油和天然气开采方面显示出巨大的应用潜力。然而，在高温下具有直接稳定粘附力和长期稳定性的纤维化水凝胶仍然存在挑战。在这里，从聚多巴胺 （PDA） 的粘合性能和热稳定性中汲取灵感，我们提出了一种简单的一锅法，在 25-90 °C 的宽温度范围内构建具有高稳定粘合性能的 PDA 包埋水凝胶。 稳定的粘附性能归因于嵌入水凝胶基质中的 PDA 的多种非共价相互作用的协同作用以及功能单体（3-丙烯酰胺丙基）三甲基氯化铵中阳离子基团的合作。这种水凝胶可以在高温下几百秒内快速凝胶化，并获得良好的机械强度以及长期的耐高温性。此外，该水凝胶作为封闭环境中的高温封堵材料应用于概念验证示范，在 90 °C 时对 1 mm 裂纹表现出 7.6 MPa 的出色承压能力，即使在破损后仍会进一步形成二次封堵区域。本研究设想，这种仿生水凝胶具有卓越的热粘附能力，在高温环境中具有广阔的应用前景。