Figure 3. The FTIR spectrum of poly n-vinyl pyrrolidione (PVP). The major characteristic PVP absorbance band was 1650 cm-1 brown shaded peak)

From

Quantitative Analysis of Copolymers and Blends of Polyvinyl Acetate (PVAc) Using Fourier Transform Infrared Spectroscopy (FTIR) and Elemental Analysis (EA)

Ronald P. D’Amelia, Samantha Gentile, William F. Nirode, Ling Huang

World Journal of Chemical Education. 2016, 4(2), 25-31 doi:10.12691/wjce-4-2-1