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The FTIR spectra of _-CD and the resin are shown in Fig. 2. The strong and wide OH peak for _-CD at 3404 cm−1 moved toward a lower wave number, and the resin had a strong and broad absorption peak at 3363 cm−1 (Ficarra et al., 2002). The introduction of acrylic acid increased OH, which led to the shift of the OH peak toward a lower wave number. Furthermore, the OH group absorption peak became broader because of the increasing hydrogen bonding between molecules. The CH2 stretching vibrations at 2925 cm−1 and 2846 cm−1 were significantly increase for the resin, which is mainly due to the formation of CH2 in the polymerization process during the introduction of acrylic acid and acrylamide monomer. Strong overlapping peaks at 1671 cm−1 can be attributed to C O stretching vibration peaks in acrylamide and carboxylic acids (Kuang, YuK, & Huh, 2011).
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