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Storage and loss modulus of (a) singly acylhydrazone-crosslinked hydrogels with varying molar ratios of ketone to hydrazine and (b) singly boronate ester-crosslinked hydrogels with varying mass ratios of PVA to PAD2. The concentration of PAD2 is fixed to 10 wt%. The data were obtained with a strain of 1.0% and a frequency of 1 Hz.
