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(a) self-healing behaviour of single/double DCBs-crosslinked hydrogels, (a1) PAD2@ADH, (a2) PAD2@PVA, (a3) PAD2@PVA@ADH. The hydrogels were coloured by carmine (red) or methylene blue (blue). Repeated dynamic strain sweep tests with a frequency of 1.0 Hz, (b) PAD2@ADH, (c) PAD2@PVA, (d) PAD2@PVA@ADH.
