Key Laboratory of Molecular Medicine and Biotherapy in the Ministry of Industry and Information Technology, School of Life Sciences, Beijing Institute of Technology, No. 5, Zhongguancun South Street, Beijing 100081, PR China.
Key Laboratory of Molecular Medicine and Biotherapy in the Ministry of Industry and Information Technology, School of Life Sciences, Beijing Institute of Technology, No. 5, Zhongguancun South Street, Beijing 100081, PR China; Faculty of Light Industry and Chemical Engineering, Dalian Polytechnic University, Light Industry Court No. 1, Ganjingzi, Dalian 116034, PR China.
Carbohydr Polym. 2021 Mar 15;256:117580. doi: 10.1016/j.carbpol.2020.117580. Epub 2020 Dec 30.
Hydrogels are widely used in many fields but generally suffer from low mechanical strength and poor self-healing performance. Here, a novel and facile method was developed to prepare a semi-interpenetrating polymer network (semi-IPN) hydrogel with layered structure and improved properties based on sodium alginate (SA) and polyacrylamide (PAM). Systematic characterizations revealed a formation mechanism of layered structure via hydrogen bonds (HBs) promoted self-assembly of SA in the porous PAM matrix. Also, HBs can also display a key role in enhancing self-healing of the hydrogel, by which the hydrogel possesses a self-healing capacity of 99 % with sprayed by a few of water. Moreover, the layered semi-IPN structure makes the tensile strength of PAMSA hydrogel reach 266 kPa. The fabricated PAMSA hydrogel with layered microstructure containing SA provides a protocol to broaden the functionality and variety of the hydrogels.
水凝胶在许多领域都有广泛的应用，但普遍存在机械强度低和自愈性能差的问题。在这里，我们开发了一种新颖且简单的方法，基于海藻酸钠（SA）和聚丙烯酰胺（PAM）制备了具有层状结构和改善性能的半互穿聚合物网络（semi-IPN）水凝胶。系统的表征揭示了通过氢键（HBs）促进 SA 在多孔 PAM 基质中自组装形成层状结构的形成机制。此外，HBs 还可以在增强水凝胶的自修复性能方面发挥关键作用，使水凝胶具有 99%的自修复能力，只需喷洒少量水即可实现。此外，层状半互穿网络结构使 PAM/SA 水凝胶的拉伸强度达到 266 kPa。这种具有层状微观结构的 PAM/SA 水凝胶为拓宽水凝胶的功能和种类提供了一种方案。
