Fig. 8.
Left column: NAM-IR spectra of different compositions of PS and PVP. Increasing concentrations of PVP is added to PS starting from the bottom of the column. Right column: measured ATR-FTIR spectra of pure PS (bottom) and PVP (top), along with computationally generated spectra obtained by linear superposition of the individual ATR-FTIR spectra of PS and PVP, in the relevant ratios. The vertical red lines indicate peaks stemming primarily from PS (at 1484 cm−1) and PVP (at 1685 cm−1), respectively. (For interpretation of the references to color in this legend, the reader is referred to the web version of the article.)