“…In traditional hydrogels, the polymer network cross-linked by covalent bonds is irreversible, and is often too brittle that could easily fatigue. Reversible dynamical covalent interactions, such as imine bonds (Ying et al, 2014;Haldar et al, 2015;, disulfide bonds (Canadell et al, 2011;Deng et al, 2012;, phenylboronate complexations (Appel et al, 2015;Yesilyurt et al, 2016), acrylhydrazone bonds (Yu et al, 2015;Guo et al, 2017), Diels-Alder reactions (Liu and Chuo, 2013;Baker et al, 2017), and reversible radical reactions (Amamoto et al, 2012;Thi et al, 2020), are attractive strategies to develop elastic and high-strength hydrogels.…”