Table 2. Assignment of the FTIR Bands^a.

sample	wavenumber (cm–1)	functional groups
PVA	3700–3180	ν (O–H)
	2941	ν (C–H)
	1430	δ (CH2)
	1099	ν (C–O)
HA	3385	ν (O–H)
	2927	ν (C–H)
	1690	ν (COO–)
	1585	ν (C=C)
	1394	ν (COO–)
	1106	ν (CO)
	1035	ν (C–N)

^aAbbreviations: ν, stretching; δ, bending.