In this work, poly(acrylic) acid‐chitosan @ tannic acid‐aluminum ion (PAA‐CS@TA‐Al³⁺) double‐network hydrogel was prepared via prefabrication, blending method, and Al³⁺ immersion method. The interaction between chitosan and tannic acid (CS@TA) was analyzed using Fourier transfer infrared spectra and UV‐Vis spectra. The UV‐Vis spectrum was also used to confirm the formation of ionic coordination in the gel. Then, the possible coordination modes were studied and analyzed. The microscopic pore structure and macroscopic strain behavior of the gel were analyzed using SEM and tensile testing, respectively, which verified that the tensile strength (≈32 KPa) and elongation at break (≈1700%) of the gel primarily resulted from its crosslinking structure. In addition, the gel also demonstrated a good self‐healing performance with recovery ≈92.2% at 60 minutes. Hence, the proposed novel self‐healing gel can provide inspiration for the preparation of future self‐healing gels.

中文翻译：

---

基于离子配位的聚丙烯酸-壳聚糖@单宁酸双网自愈水凝胶

在这项工作中，通过预制，掺合方法和Al ³⁺制备了聚丙烯酸丙烯酸壳聚糖@单宁酸铝离子（PAA-CS @ TA-Al ³⁺）双网络水凝胶。浸没法。使用傅立叶转移红外光谱和UV-Vis光谱分析了壳聚糖和单宁酸（CS @ TA）之间的相互作用。UV-Vis光谱也用于确认凝胶中离子配位的形成。然后，研究了可能的协调模式。分别使用SEM和拉伸测试分析了凝胶的微观孔结构和宏观应变行为，这证明了凝胶的拉伸强度（≈32KPa）和断裂伸长率（≈1700％）主要是由于其交联结构引起的。此外，该凝胶还表现出良好的自我修复性能，在60分钟时的回收率约为92.2％。因此，提出的新型自愈凝胶可以为未来的自愈凝胶的制备提供灵感。