Abstract
An electron microscopy and a high-resolution 13C-n.m.r. study of cellulose is described and a previously unreported solid-state 13C-n.m.r. spectrum of cellulose III is presented. It is shown that a cyclic transformation of highly crystalline cellulose I ( Valonia) into cellulose III and back to cellulose I results in a material whose crystallites have a reduced lateral dimension similar to that in cotton and whose electron-diffraction patterns and 13C-n.m.r. spectra are very close to that of cotton. In addition, some new features in the 13C-n.m.r. spectrum of Valonia cellulose are reported.
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