Abstract
The relation between the average degree of polymerization (D. P.) or its distribution of polyvinyl alcohol (P. V. A.) and physical properties of dry spun fiber was investigated.
The stretchability of the obtained fiber was gradually reduced by raising average D. P. but wasremarkably improved by narrowing D. P. distribution. Furthermore, as the results of the continued studies, the poor stretchability was obvious due to the presence of larger molecules in P. V. A. In such case, the fact that the drawn fiber at approx. maximum draw ratio became milky fiber and then was broken.
On the study of a few mechanical properties in addition to the above stretchability, it was understood that the tenacity, the elongation, and the hot water resistance were almost independent of the D. P. distribution of P. V. A., but only the hot water resistance was greatly dependent upon the average D. P. of P. V. A.
