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Attenuated total reflectance-infrared spectroscopy (ATR-FTIR) spectra of (a) the hydrogel samples and physically cross-linked gelatin reported in the range of 2000–700 cm−1; (b) a comparison between the spectra of the different cured samples and the spectrum of uncured poly(ethylene glycol) diacrylate (PEGDA) in the region 1950–1450 cm−1.
