IR spectra (Figure 4)
showed two intense absorption bands at 1720 and 1281 cm−1
of NAP11 and at 1720 and 1273 of NAC1 specific for C=O and
C–O stretching vibrations, respectively.The absorption bands
at 2932 and 2954 cm−1 are due to C–H stretching vibrations
of methyl, methylene groups. These prominent absorption
bands confirm the structure of poly-