抄録
The physical properties of the acetate rayon acetylated in fiber state by ketene were tested, especially on denier, degree of polymerization, tenacity and elongation. As the result of testing, judging from the ratio of the increase in denier accompanied by the increase in the degree of acetylation, it was observed that the shrinkage of fiber had occured.
The degree of polymerization degraded to some degree at the initial stage of the reaction, namely, until the acetic acid value had reached about 20%, but thereafter it degraded only slightly up to the cellulose diacetate.
It was found that the tenacity and elongation of the acetylated fiber, when its acetic acid value is about 25%, are particularly unsuitable for the practical fiber.
