MUTUAL DIFFUSION OF COMPONENTS IN CELLULOSE NITRATE SOLUTIONS WITH VARIOUS NITROGEN CONTENTS

The dynamics of mutual dissolution of components in the cellulose nitr ate (CN)-glycerol triacetate system was studied for various degrees of the CN etherification (nitrogen contents 11.2-13. wt %). The mutual d iffusion coefficients as functions of the nitrogen content in CN show a tendency to extremal variation in the regions of both dilute and con centrated solutions. The effects of molecular mass characteristics and the degree of crystallinity on the diffusion was studied for a system with fixed nitrogen content (12.2 wt %). In concentrated CN solutions , the diffusion coefficient shows a correlation with the degree of cry stallinity, and in dilute solutions, with the weight-average molecular mass of the polymer.