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Fourier transform-infrared spectra of the poly(vinyl alcohol) (PVA), polyurethane/poly(vinyl alcohol) (PU/PVA), and polyurethane (PU) films.
In the PU/PVA spectrum, the -OH absorption peak at 3,330 cm−1 was clearly decreased compared with that in the PVA spectrum, while the absorption peaks of C-O-C at 1,106 cm−1 and N-H from carbamates at 1,541 cm−1 were increased.
