Infrared Absorption Spectra of Cyanoethylated Cellulose Fibres

摘要

Infrared absorption spectra of cyanoethylated cellulose possessing different degrees of substitution were investigated and the characteristic structural units within the cyanoethylated ellulosic fibres were elucidated. The infrared absorption bands of C-H, C ident to N and OH stretching vibrations were assigned and correlated to provide more information about the molecular structure changes of the produced phases due to cyanoethylation of the cellulosic fibres. The infrared absorption bands at 3356 approx = 3430 cm~(-1) of the C-H stretching vibrations are shifted to higher frequencies, and their absorbances decreases as the extent of cyanoethylation increases. The intensity of the infrared band at 2250 cm~(-1) of the cyano group increases with the increase of -OH replacement by -CN groups. The mean hdyrogen bond strength of the investigated samples was calculated using the A3420/A1640 ratio. Also, the crystallinity indices were calculated using the A1370/A2900 and A1430/A900 ratios.