STUDY ON SPINNING MECHANISM OF VISCOSE: (I) THE EFFECTS OF SOME IONS ON THE MUTUAL DIFFUSION OF NaOH-H2SO4 SYSTEM

Effsects of some ions on the mutual diffusion of NaOH-H2SO4 system through a cellophane film as a basic study on the spinning mechanism of viscose were studied and the following results were obtained: (1) S-- ion in the alkali solution and Zn++ ion in the spin bath solution restrict the diffusion of the spin bath components into the alkali solution and allow the diffusion of the alkali components into the spin bath solution. (2) The restrictive effects of the diffusion of the spin bath components into the alkali solution by some metalic ions in the spin bath solution have a relationship with the precipitating pII of these metalic sulfides or hydroxides, in the order of Mg++, Fe+++, Al+++, Mn++, Fe++, Zn++, the precipitating pH of metalic sulfide or hydroxide is lower and the restrictive effects of the diffusion of the spin bath components into the alkali solution is larger. These results were discussed in relation to the spinning mechanism of viscose.