Low-frequency IR spectroscopy in the study of the structures of cellulose and cellulose nitrates

The application of low-frequency IR spectroscopy in the structural analysis of polymers is examined. The vibrations of crystal lattices and polymer chains as well as deformation and torsional vibrations manifested in the low-frequency part of the IR spectrum are discussed. Studies in this field are reviewed critically and the experimental and theoretical data concerning the interpretation of the low-frequency spectra of monosacchrides, polysaccharides, and their nitro-derivatives are surveyed. Attention is concentrated on the establishment of 'spectrum-structure' correlations for cellulose in the course of its physical modification and chemical reactions (nitration). The bibliography includes 79 references.