Abstract
The amidoximation of the partially cyanoethylated polyvinyl alcoool fiber was carried out in the aqueous NH2 OH HCl solution containing Na2SO4 (20%). The most suitable conditions were pH 7_??_9, NH2OH/CN mol ratio 10, reaction temperature 100°C, and reaction time 1_??_2 hr.
Using the partially cyanoethylated PVA fiber (several % of cynoethylation degree), the amidoximated fiber showed the following characteristics. Properties.
1. In the formalization for purpose of giving the shrinkproof in boiling water, the concentration of H2SO4 is able to let down about 10%.
2. The elastic recovery of the amidoximated and then formalized fiber was remarkably improved especially at the range of lower elongation without much loss of tensile strength. This effect was suggested to be due to an intermolecular cross-linking produced between the amidoxime groups.
3. The affinity for the acid dyestuff of the treated fiber was very high. The affinities for basic, Vat and disperse dyestuffs were also higher than that of PVA and cyanoethylated fiber.
