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. 2021 Apr 9;22(8):3901. doi: 10.3390/ijms22083901

Figure 3.

Figure 3

Representative 1H NMR spectra of modified polymers used in this study. (A–D) 1H NMR spectrum of different PVA amination for 24 h reaction time point (sample nomenclature PVA-AX-Y, where X corresponds to the reaction time (h) and Y to the maximum theoretical amination percentage). (A) Pure PVA, (B) PVA-A24-10, (C) PVA-A24-50, and (D) PVA-A24-100. Successful backbone modification was verified by the peak at 2.9 ppm corresponding to amine linker. (E) 1H NMR spectrum of norbornene-modified PVA. Successful backbone modification was verified by vinyl peak at 6.25 ppm.