Multiple Physical Cross-Linker Strategy To Achieve Mechanically Tough and Reversible Properties of Double-Network Hydrogels in Bulk and on Surfaces
Multiple Physical Cross-Linker Strategy To Achieve Mechanically Tough and Reversible Properties of Double-Network Hydrogels in Bulk and on Surfaces
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DOI：
10.1021/acsapm.8b00232
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发表时间：
2019-02
影响因子：
5
通讯作者：
Yanxian Zhang;Baiping Ren;Shaowen Xie;Yongqing Cai;Ting Wang;Zhangqi Feng;Jian-xin Tang;Qiang Chen
中科院分区：
文献类型：
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作者：
Yanxian Zhang;Baiping Ren;Shaowen Xie;Yongqing Cai;Ting Wang;Zhangqi Feng;Jian-xin Tang;Qiang Chen
开发坚韧和粘合的水凝胶对于不同的应用至关重要，包括伤口敷料、软机器人和可穿戴设备。然而，在水凝胶和表面之间实现强而可逆的粘附被证明是一个巨大的挑战，因为强粘附和可逆粘附是水凝胶粘合剂的两个非常理想但相反的特性。现有的水凝胶粘合剂在不同的表面上具有一次性不可逆的强附着力和可逆的弱附着力。在这里，我们开发了一种完全物理交联的琼脂/pAAEE （n -聚（丙烯酰胺乙氧基乙醇））双网络（DN）水凝胶，具有高体积力学性能和强可逆表面附着力。两个网络内高密度氢键的协同作用，可以同时提高材料的力学性能（拉伸应力为1.84 MPa，拉伸应变为2.5 mm/mm，弹性模量为1.85 MPa，撕裂能为1612 J/m2）和快速的机械自恢复。
Development of tough and adhesive hydrogels is critical for different applications, including wound dressing, soft robotics, and wearable devices. However, achieving strong and reversible adhesion between hydrogels and surfaces have proved to be a great challenge, because strong adhesion and reversible adhesion are the two highly desirable but opposite properties of hydrogel adhesives. Existing hydrogel adhesives possess either one-time, irreversible, strong adhesion or reversible weak adhesion on diverse surfaces. Herein, we developed a fully physically cross-linked double-network (DN) hydrogel of Agar/pAAEE (N-poly(acryloylaminoethoxyethanol)) with both high bulk mechanical properties and strong reversible surface adhesion. Synergetic cooperation of high-density hydrogen bonds within both networks enables to simultaneously promote mechanical properties (tensile stress of 1.84 MPa, tensile strain of 2.5 mm/mm, elastic modulus of 1.85 MPa, and tearing energies of 1612 J/m2) and fast mechanical self-recove...