485865.fig.002a
(a)
485865.fig.002b
(b)
Figure 2: Representative spectra in the region 1500–1000 cm−1 of PEO in water solution after 2 h (a) and 4 h (b) of exposure to a SMF at 200 mT. The strong vibration band around 1465 cm−1 is splitted in two bands and can be assigned to CH2 scissoring vibration bands. The 1349 cm−1 peak is related to the EO methylene wagging vibrations of the gauche conformation. The strong band around 1080 cm−1 can be assigned to the C–O–C stretching hydrated bond. Red and blue lines refer to exposed and unexposed samples, respectively.