The Formation of Cellulose IV in the Viscose Spinning

The formation of cellulose IV in the viscose spinning process was investigated by the X-ray diffraction measurements. Zinc cellulose xanthate model filaments were regenerated at various temperatures and their X-ray diffraction diagrams were examined. It was observed that the formation of cellulose IV is remarkable when zinc cellulose xanthate is regenerated at the temperature above a critical temperature which lies between 80°C and 100°C. The mechanism of partial formation of cellulose IV in the viscose spinning process was elucidated as follows: when zinc cellulose xanthate formed in the first bath is regenerated at a sufficiently high temperature in the second bath, the formation of cellulose IV consequently results. The main factors involved for the formation of cellulose IV are higher temperature of the second bath and higher concentration of zinc sulfate in the first bath.