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FTIR spectra of the PVP/CNC composite films: 1—neat PVP; 2—PVP/CNC-4.6; 3—PVP/CNC-10.9; 4—PVP/CNC-16.3; 5—PVP/CNC-19.6; 6—PVP/CNC-28.9; 7—PVP/CNC-37.9; 8—neat CNC: (a) in the range of wavenumbers of 4000–2500 cm−1; (b) in the range of wavenumbers of 2500–500 cm−1. PVP, polyvinylpyrrolidone; CNC, cellulose nanocrystals.
