Table 1.

Band assignment of IR vibrational modes for gelatin, PVA, acrylic acid (AA), and PVA/PAA films.

Entry	N–H st.	–O–H st.	H–O–H st.	C–H st.	=C–H st.	C=O st.	C=C st.	CH2 b.	C–O b.	C–O st.	C–C st.
Gelatin	3793	3250	3595	2987	3125	1639	1535	1499	1480	1247	1090
PVA	-	3347	3443	3000		-	-	-	1554	1244	1085 1035 975
AA	-	3090	-	3000	2968 2902	1700	1434	-	1413	1298	1047 976
PVA/PAA 35 µm	-	3324	3443	3005	3094	1657–1618	1550	1340	1454	1244	1085 1035 976
PVA/PAA 30 µm	-	3324	3443	3005	3094	1657–1618	1550	1340	1454	1244	1085 1035 976

st. stretching; b. bending.