Yukio Mitsuishi

ALKALI SWELING TREATMENT OF HIGH TENACITY RAYONS

The mechanism of alkali swelling treatment of high tenacity rayons was investigated and also preparation of “Toramomen type rayon” by a method of alkali sweling treatment followed by stretching of high tenacity rayons was attempted.The results obtained are as follows;1. The stress-strain curves of alkali treated high tenacity rayons appear relaxed, and those in, high degree of swelling stretched. Therefore, intermediate regions of stress-strain curves in swelling mediums become narrower than those of the untreated.2. The peaks of the lateral order distribution curves for high tenacity rayons shift to higher order region by the alkali treatment.3. In acid hydrolysis curves, coefficient Kc becomes smaller and extrapolated value Co becomes larger, that is, the size of crystallite and the degree of crystallinity become larger than those of untreated by the alkali swelling. So the structure of high tenacity rayons approaches to that of “Toramomen type rayons”. The results of X-ray diffraction analysis shows the same tendency.4. “Toramomen type rayons” are obtained by stretching the high tenacity rayons in an alkali solution of proper concentration (the crystallites, anchoring points of network structure, are almost destroyed by swelling) and then by washing.