The Action of β‐Propiolactone on Wool

Abstract

There is little reaction between dry wool and β‐propiolactone when the latter is dissolved in anhydrous benzene, but reaction is vigorous in alcoholic solution at 50d̀c. Combination is not confined to the basic side‐chains of salt linkages, though 50% of the latter are broken during 48 hours' treatment. As the resistance of the fibres to deformation in water and acid is reduced, it was expected that treated fabric would show an increased rate of shrinkage during milling, especially as the percentage hysteresis between extension and contraction is reduced. Little difference could, however, be detected between treated and untreated fabrics during milling with soap or acid, and the felting power of loose wool is reduced by treatment with the lactone, probably because the beneficial effects of modified elastic properties are offset by reduced sealiness of the fibres.