Fig. 6: Characterization of SAN before (SAN₄₃) and after complete dehydrocyanation (dSAN₄₃).

a ¹H-NMR spectra and corresponding chemical structures of different units. Non-polymer peaks are indicated with * and correspond to impurities (δ = 7.26 ppm = CHCl₃, δ = 3.76 & 1.85 ppm = THF, δ = 1.56 ppm = H₂O), b ¹³C-NMR spectra and corresponding chemical structures of different units. Non-polymer peaks are indicated with * and correspond to THF (δ = 25.7 ppm), c FTIR-ATR spectra with characteristic peaks for nitrile groups (2238 cm⁻¹) and C = C double bonds (967 cm⁻¹)_. The spectra are offset for clarity, d GPC chromatograms with M_W and M_n values. The molecular weight distributions are offset for clarity.