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Frequency sweep tests showing (a) storage and (b) loss moduli of P2K and P8K hydrogels, (c) rheological self-healing test for the P8K hydrogel showing storage modulus (G′) and loss modulus (G″) at alternating strains of 1 and 600% (three cycles), and (d) macroscopic self-recovery images of the P8K hydrogel: (d-1) freshly fabricated hydrogels (with and without food dye) and (d-2,3) freshly cut gel pieces placed in contact and their healing to a single piece.
