Regenerated cellulose structural details

In the amorphous cellulose sample the chemical shift of the C4 carbon is as low as 81.6 ppm and very close to the corresponding value of the low molecular weight cellulose in DMSO solutlon(see Table IV). This sample was prepared by dissolution of Watman cellulose powder CF-1 in DMSO-paraformaldehyde followed by precipitation in ethanol. Therefore, the molecular chains of this sample must be fully disordered in comparison with those of the regenerated cellulose fibers and native cellulose. The more detailed structure of the noncrystalline components of different cellulose samples will be discussed elsewhere. 

Since the details of the crystal structure are of very little importance with regard to the structure and the behaviour of cellulose gels, we shall forbear from discussing them. Neither the lattice structure nor the amount of crystalline substance in cellulose has, as yet, been found to be affected by ordinary mechanical deformation. The orientation of the crystallites changes, but it would seem as though the crystallites themselves remain, as a rule, unaffected. In all regenerated cellulose fibres the percent e of crystalline substance is astonishingly constant, a fact which remains to be explained... 

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