Preparation and Characterization of HPMC/PVP Blend Films Plasticized with Sorbitol

Table 2

Spectroscopically measured wavenumbers of HPMC/PVP polymer blend films plasticized with Sorbitol.

5% HPMC + 2% PVP (S) wave no. (cm^−1)	S + 0.2 g Sorbitol wave no. (cm^−1)	S + 0.4 g Sorbitol wave no. (cm^−1)	S + 0.6 g Sorbitol wave no. (cm^−1)	S + 0.8 g Sorbitol wave no. (cm^−1)	Correlation
3361.50	3358	3326	3335	3305.5	O–H stretch
2911	2908.50	2921.50	2911.50	2910.0	C–H stretch
2127.23	2126.61	2126.96	2130.15	2127.27	C=N stretch
1657.50	1656	1654	1651.50	1651	–C=C stretch
1495.30	1495.6	1495.52	1495.85	1494.50	–C–C stretch
1443.50	1440.0	1444.50	—	—	–C–H bend
1374.50	1324	1375.50	1363	—	–C–H rock
1299.0	—	1299.50	—	1230	–C–H wag(methyl)
1108.50	1114.0	1107.50	1117.50	—	–C–N stretch