Super-tough and rapidly self-recoverable multi-bond network hydrogels facilitated by 2-ureido-4[1H]-pyrimidone dimers
Super-tough and rapidly self-recoverable multi-bond network hydrogels facilitated by 2-ureido-4[1H]-pyrimidone dimers
复制标题
2-脲基-4[1H]-嘧啶酮二聚体促进的超坚韧且快速自恢复的多键网络水凝胶
DOI：
10.1016/j.cclet.2020.04.039
复制
发表时间：
2021
影响因子：
9.1
通讯作者：
Xie Xu-Ming
中科院分区：
文献类型：
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作者：
Xu Hao;Xie Xu-Ming
多键网络（MBN）水凝胶包含具有不同键缔合能的分级动态键作为能量耗散单元，从而实现超韧机械性能。在本工作中，我们在盐酸溶液中，将质子化的2-脲基-4 [1H]-嘧啶酮（UPy）单体与丙烯酸进行共聚。在除去过量的HCl后，UPy基序被去质子化并形成二聚体，从而产生含UPy的MBN水凝胶。所获得的MBN水凝胶（75wt%水含量）表现出超韧的机械性能（0.39 MPa至2.51 MPa拉伸强度），具有由UPy二聚体的解离耗散的巨大能量（1.68 MJ/m3至11.1 MJ/m3）。离子键的引入可以进一步提高材料的力学性能。此外，由于它们的动态性质，UPy二聚体和离子键都可以在解离后重新缔合，从而产生优异的自恢复能力（仅在1小时内恢复效率约为90%）。这种优异的自恢复能力主要来源于基于UPy基序的高二聚化常数的UPy二聚体的再缔合
Multi-bond network (MBN) hydrogels contain hierarchical dynamic bonds with different bond association energy as energy dissipation units, enabling super-tough mechanical properties. In this work, we copolymerize a protonated 2-ureido-4[1H]-pyrimidone (UPy)-contained monomer with acrylic acid in HCl solution. After removing excess HCl, UPy motifs are deprotonated and from dimers, thus generating an UPy-contained MBN hydrogel. The obtained MBN hydrogels (75 wt% water content) exhibit super-tough mechanical properties (0.39 MPa to 2.51 MPa tensile strength), with tremendous amount of energy (1.68 MJ/m3to 11.1 MJ/m3) dissipated by the dissociation of UPy dimers. The introduction of ionic bonds can further improve the mechanical properties. Moreover, owing to their dynamic nature, both UPy dimers and ionic bonds can re-associate after being dissociated, resulting in excellent self-recovery ability (around 90% recovery efficiency within only 1 h). The excellent self-recovery ability mainly originates from the re-association of UPy dimers based on the high dimerization constant of UPy motifs