Infrared spectra of crystalline polysaccharides. III. Mercerized cellulose

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Abstract
The infrared spectra of doubly oriented films of mercerized ramie and Fortisan crystallites were observed over the 650–3600 cm. −1 frequency range. Polarization properties of the bands were determined. The CH2 symmetric bending frequency was found to be parallel polarized, from which it was concluded that the C6 hydroxyl groups are not engaged in intramolecular hydrogen bonds. The perpendicular bands in the OH stretching region are associated with intermolecular hydrogen bonds most probably in the 101 plane. The two bands showing strong parallel dichroism in the OH stretching region are associated with O3 → O′5 intramolecular hydrogen bonds. The observed data allowed a critical evaluation of the various hydrogen bonding schemes which have been proposed for cellulose II. Alternate schemes which are in better agreement with the infrared data are considered.