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 w ith the amorphous orientation factor. The relevant regression curves a re similar to that of the relation between the elongation at break res p. the tensile modulus and the crystallite orientation factor; the lat ter preceding the amorphous orientation factor with increasing total o rientation. Hence it is concluded, that the elongation mechanism of re generated cellulose fibre does not consist only of orientation of crys tallites, but that additionally a straightening and orientation of the less ordered molecular segments in the interstices between the crysta llites has to be assumed.