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A novel self‐healing poly(vinyl alcohol) (PVA)‐based hydrogel is developed by cross‐linking PVA chains through multi dynamic covalent bonds by use of a small cross‐linker composed by 4‐formylphenylboric acid (FPBA) and lysine (Lys). The dynamic borate‐imine‐imine‐borate bond structure between PVA chains endows the hydrogel excellent stretchability and ultra‐fast self‐healing ability without external...
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