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In article number 1702616, Li‐Heng Cai, David A. Weitz, and Jinrong Wu fabricate a tough, self‐healing polymer network by crosslinking randomly branched polymers that carry motifs able to form both reversible hydrogen bonds and permanent covalent crosslinks. This concept of using molecular design to mix covalent and reversible bonds should enable the development of tough, self‐healing polymers for...
Self‐healing polymers crosslinked by solely reversible bonds are intrinsically weaker than common covalently crosslinked networks. Introducing covalent crosslinks into a reversible network would improve mechanical strength. It is challenging, however, to apply this concept to “dry” elastomers, largely because reversible crosslinks such as hydrogen bonds are often polar motifs, whereas covalent crosslinks...
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