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Temperature-dependent infrared (IR) spectra of a poly(vinyl alcohol) (PVA) film were analyzed by perturbation-correlation moving-window two-dimensional (PCMW2D) correlation spectroscopy. The PCMW2D correlation analysis revealed that there are two characteristic bands in the O–H stretching region, though only one broad feature is found in the original IR spectra. These two bands were assigned to bulk...
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