Effect of changes in crystalline structure on the infrared absorption spectrum of cellulose

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Abstract
The absorption spectra of native, mercerized, and amorphous celluloses are recorded for the region from 2 to 16[mu]. Cellulose having the X-ray diffraction pattern of the native, or type I, crystal lattice is represented in this study by bacterial cellulose, cotton fibers, Valonia cell wall, and the residue from the hydrolysis of cotton linters. Cellulose having the X-ray diffraction pattern of the mercerized, or type n, crystal lattice is represented by regenerated cellulose, the residue from the methanolysis of mercerized cotton linters, and mercerized bacterial cellulose. Amorphous cellulose was obtained by milling the residue from the hydrolysis of cotton linters in a vibratory ball mill. Infrared spectra of the 3 types were studied. The most striking differences were found in the 7- 8 and 9-10[mu] regions. Although factors other than decrease in type I crystallinity may contribute to the observed changes in absorption characteristics, the changes may prove useful in evaluating changes in crystalline structure of cellulose.

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