Abstract
A method has been envolved, using persulphates as initiators, whereby polyacrylonitrile can be deposited in wool in a short time and in the presence of air. Persulphates alter the mechano-chemical properties of wool, e.g., set, supercontraction, to a much greater extent than the hydrogen peroxide–ferrous ion initiator system, which has virtually no effect on them. Polymer deposited with persulphates is almost as effective in reducing milling shrinkage as polymer deposited with hydrogen peroxide, polymer contents of 25% being sufficient to reduce shrinkage from 30% to about 5%, or from 13% to 2—4%. The effectiveness of polyacrylonitrile in reducing shrinkage cannot be attributed to changes in fibre properties usually considered to be of importance in determining the milling characteristics of wool fibres : the directional friction effect of the fibres is almost unaltered, their elastic properties are little affected, and, as loose wool is also made shrink-resisiant, “spot-welding” of the fibres is not impo...
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