Super-tough and rapidly self-recoverable multi-bond network hydrogels facilitated by 2-ureido-4[1H]-pyrimidone dimers  

作　　者：Hao Xu Xu-Ming Xie 

机构地区：[1]Key Laboratory of Advanced Materials(MOE),Department of Chemical Engineering,Tsinghua University,Beijing 100084,China

出　　处：《Chinese Chemical Letters》2021年第1期521-524,共4页中国化学快报（英文版）

基　　金：the National Natural Science Foundation of China(Nos.21774069,51633003 and 21474058)for financial support。

摘　　要：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[1 H]-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% watercontent) exhibit super-tough mechanical properties(0.39 MPa to 2.51 MPa tensile strength),with tremendous amount of energy(1.68 MJ/m^(3) to 11.1 MJ/m^(3)) 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.

关 键 词：Multi-bond network Quadruple hydrogen bonding SELF-RECOVERY Super-tough hydrogel 2-Ureido-4[1H]-pyrimidone dimer 

分 类 号：O648.17[理学—物理化学]