Abstract
The cross-linked or non-cross-linked formalized poly (vinyl alcohol) (PVA) fibers were prepared by formalizing PVA fibers under the conditions where the cross-links were formed or not, or by cleaving the cross-links of the cross-linked formalized products with dilute sulfuric acid. The elastic properties and the durability under the complicated stresses applied onto the fibers repeatedly in the wet state were examined on these fibers. The initial modulus, its temperature dependence and the elastic recovery in the standard state were scarcely affected by the cross-links. The durability in the wet twisting abrasion test and in the washing test appeared to be closely related to the content of cross-links.
