Abstract
A useful index of the resistance of the protein chains of wool to oxidative degradation is described. The method involves simply the measurement of time to break specimen wool fibres, yarn, or fabric exposed to an oxidizing solution, in this case, of sodium hypochlorite. The time to break is shortened when the fibres are pretreated with fine particles of carbon or clay, providing the fibres are swelled sufficiently when the particles are applied. Blocking of amino groups with isocyanates increases the time to break. The presence of the vulcanizing agent, tetramethyl thiuram disulphide, in wool affords some measure of protection against radiation damage by electron bombardment, as indicated by subsequent time-to-break tests in hypochlorite. The oxidative removal of hydrogen atoms from one of the –NH–CHR– groups of diketopiperazine, found to occur with hypobromite by Goldschmidt1–5, is suggested as an initial step in the degradation of diketopiperazine by ultraviolet irradiation. Similar removal of hydrogen...
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