Abstract
Investigations were made on the dissolution rate of rayon pulp fibers, original and degraded, and the amount of amorphous regions in undissolved fibers in emulsion xanthation. The dissolution process of fibers was also observed microscopically.The results are as follows:a) The lower the degree of polymerization is, the higher the rate of dissolution becomes, and the range of optimum alkali concentration for dissolution becomes wide.b) The amount of amorphous regions in undissolved fibers increases during xanthation, and is maximum when alkali concentration is about 10%.c) Although xanthation reaction occurs only at the contact points of CS2 droplets with fibers, occasional contacts are sufficient for the progress of xanthation. For this reason viscose-formation by simultaneous reaction in emulsion form takes place.
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