ON THE ELONGATION MECHANISM OF REGENERATED CELLULOSE FIBERS

The elongation at break as well as the tensile modulus of solvent spun cellulose fibres, both measured in the conditioned state, correlate with the amorphous orientation factor. The relevant regression curves are similar to that of the relation between the elongation at break resp. the tensile modulus and the crystallite orientation factor; the latter preceding the amorphous orientation factor with increasing total orientation. Hence it is concluded, that the elongation mechanism of regenerated cellulose fibre does not consist only of orientation of crystallites, but that additionally a straightening and orientation of the less ordered molecular segments in the interstices between the crystallites has to be assumed.