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FT-IR spectra recorded for (a) adipic acid dihydrazide (ADH) cross-linker, (b) DAAM monomer, and (c) the freeze-dried product obtained from the reaction of ADH with DAAM at 25 °C for 6 h using an ADH/DAAM molar ratio of 0.50. Conditions: 20% w/w solution, pH 2.5.
