FTIR spectra of PVA, crosslinked PVA/CS blend,
uncrosslinked PVA/CS blend and CS membranes are shown
in Fig. 1(a–d). FTIR spectra of plain CS (Fig. 1(d)), shows a
broad peak at wavenumbers 1570–1655 cm−1, which indicates
the presence of amides I and II. The wavenumber at 2833 cm−1