STUDIES ON DIFFUSION PHENOMENA IN WET SPINNING OF VISCOSE FIBER:(VI) DIFFUSION WITH RAPID REACTION

Abstract

Regarding the formation of Zn-xanthate from cellulose sodium xanthate, the fundamental study was made with xanthate model filaments. Influences of ZnSO4 concentration and temperature of reaction bath and filament diameter (a) on Zn-xanthate formation were investigated.The results are as follows:(1) Clear boundary line (radius ξ from center of filament at time t) appeares between Na-xanthate and Zn-xanthate.(2) The higher the concentration of ZnSO4 in reaction bath is, the more quickly boundary line reaches to the center of the filament.(3) In spite of the diameter changes of the filament, the relations of ξ/a_??_t/T (T: time until the boundary line reaches the center of filament) are drawn in one curve. The relation of T_??_a2 is straight.(4) Regardless of the temperature of reaction bath, ξ/a_??_t/T relations are indicated by one curve; however, the value of T becomes smaller with rising temperature.(5) With increase of cellulose content of the filament, the value of T increases.