An inexpensive one-pot route to self-healing hydrogels with pH-tunable modulus is presented. Hydrogels were formed by reacting tannic acid, trivalent metal ions and polyallylamine. Below pH 8 the hydrogels were supramolecular while above, covalent cross-linking strengthened the hydrogels. From concentrated mixtures, threads were spun, acting as water sensitive mechanical locks.
M. Krogsgaard, A. Andersen and H. Birkedal, Chem. Commun., 2014, 50, 13278 DOI: 10.1039/C4CC05293E
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