Abstract
The crystal transformation of Valonia cellulose induced in a dilute alkaline solution at high temperatures has been examined by high-resolution 13 C NMR spectroscopy. The C1 and C4 resonance lines, which are characteristic triplets for the celluloses from primitive organisms, markedly undergo changes in relative intensities of the constituent lines with increasing annealing temperature, and those lines are finally converted to doublets with almost equivalent intensities. Such results were successfully analyzed interms of the composite crystal model in which native cellulose crystals are assumed to be composites of two allomorphs, celluloses I α and I β , resulting in confirmation of the validity of the composite crystal model
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