Reaction of Wool with Permonosulfate and Related Oxidants

Abstract

As part of a program directed at zero-AOX shrinkproofing treatments, we have compared the reactivity of different oxidants with wool by following their disappearance under similar conditions. The reactivity series was as follows: aqueous chlorine > DCCA ~ permonosulfate > permanganate / salt > peracetic acid > permanganate > persulfate ~ hydrogen peroxide. This series was not related to redox potentials but generally followed the level of shrink resistance imparted by the oxidant. Fourier transform infrared spectroscopy using the attenuated total reflectance technique showed significant differences in the amounts of cystine oxidation products formed in the oxidations above. One new finding was the direct formation of low concentrations of Bunte salts by the oxidation of wool with persulfate. We further studied the surface of permonosulfate-treated fibers with scanning electron microscopy and frictional measurements. Permonosulfate treated wool fibers produce Allwörden sacs with chlo rine water, whereas aqueous chlorinated fibers do not. We suggest that the most likely mechanism for shrink resistance in permonosulfate treatments is the removal of de graded protein from below the exocuticle, producing a modified surface with a reduced differential friction between the "for" and "against" scale directions.

Adsorption of Amino-Functional Polymer Particles onto Keratin Fibres

“…at 1040 cm 01 and 1024 cm 01 respectively (16,36). No Infrared spectra were collected using a Perkin-Elmer Sys-detectable change in the spectra can be observed, which tem 2000 Fourier transform infrared spectrometer equipped indicates that the t-BuOK/t-BuOH treatment has not with a SPECAC Model 11900 variable angle attenuated total changed the level of oxidation of the sulfur species present reflectance (ATR) accessory and a narrow band MCT detec-in the upper 70 nm of the wool fiber surface.…”

“…In the second step was able to demonstrate that more particles were adsorbed the wool is treated with sodium sulfite which generates Bunte at higher pH or electrolyte concentration. Contrary to the salts (Cys-SSO 0 3 ) (16).…”

“…The PMS treated wool clearly shows the absorbance band due to cysteic acid at 1040 cm 01 . In order to quantify the level of cysteic acid in this sample a series of spectra were recorded of wool samples treated with different levels of chlorine, which also produces cysteic acid in the wool (16). Comparison of the second derivative of the 1040 cm 01 band showed that the amount of cysteic acid in the PMS treated wool is comparable to wool treated with 1% chlorine.…”

Wool: Structure, Properties, and Processing

“…This is used in the form of its potassium triple salt, containing potassium sulfate and bisulfate. It is employed in batch processes at elevated temperatures, because it reacts more slowly with wool than chlorine (114). The process sequence is similar to that used for chlorine-based treatments.…”

Polysiloxane Softener Coatings on Plasma‐Treated Wool: Study of the Surface Interactions

“…[3,4] Traditional shrink-resist treatments use chemicals that may produce a highly polluted waste water. [5] In addition, they may even damage the bulk of the fibre. Low…”