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(a) ATR-FTIR spectra of original cotton fabric and cotton fabric grafted alginate-Ca2+/P(NIPAAm-co-EGMA360) hydrogel from 4000 to 600 cm−1. The monomer ratio of NIPAAm to EGMA360 are 20:0 and 18.5:1.5. (b) Zoom-in the ATR-FTIR spectra ranging from 1800 to 850 cm−1.
