基于纳米颗粒的瞬时交联的坚韧且自修复水凝胶。
Tough and self-healing hydrogels based on transient crosslinking by nanoparticles.
机构信息
Endodontics Department of Stomatological Hospital, Jilin University, Changchun 130021, P. R. China.
Polymeric and Soft Materials Laboratory, School of Chemical Engineering, and Advanced Institute of Materials Science, Changchun University of Technology, Changchun, 130012, P. R. China.
出版信息
Soft Matter. 2022 Mar 2;18(9):1885-1895. doi: 10.1039/d1sm01439k.
In this investigation, transient crosslinking was constructed to obtain a hydrogel with excellent mechanical and self-healing properties. Firstly, core-shell particles with hydrophilic amino groups were prepared by emulsion polymerization and subsequently dispersed into hydrophobic association polyacrylamide hydrogels. Transient crosslinking was constructed through hydrogen bonding between core-shell particles and polyacrylamide. As a result, the hydrogels exhibited a tensile strength of 1.4 MPa and self-healing efficiency of 98% at 24 h. Furthermore, reconstruction of the transient crosslinking was confirmed from rheological measurements. Therefore, the essential reinforcement principle based on transient crosslinking would open a novel strategy to obtain hydrogels with superior toughness and self-healing properties.
在这项研究中，通过构建瞬时交联制备了具有优异力学性能和自修复性能的水凝胶。首先，通过乳液聚合制备了带有亲水性氨基的核壳粒子，然后将其分散到疏水缔合聚丙烯酰胺水凝胶中。通过核壳粒子与聚丙烯酰胺之间的氢键作用构建瞬时交联。结果，水凝胶在 24 小时时表现出 1.4 MPa 的拉伸强度和 98%的自修复效率。此外，流变学测量证实了瞬时交联的重建。因此，基于瞬时交联的基本增强原理为获得具有优异韧性和自修复性能的水凝胶提供了一种新策略。
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