Thermal insulation of buildings using sheep wool is not too widespread due to the serious competitors in this field, that is, expanded polystyrene and mineral wool. Since only wool of high quality is utilized in the textile industry, unprocessed wool often regrettably becomes waste at loading depots. Sheep wool is a valuable material with unique properties used traditionally and especially in the garment industry. The most stable secondary structure was observed in nonirradiated wool but even this showed a small but observable change after a longer time, too. The pattern of the conformational composition of the secondary structure ( α-helix, β-sheet, random, and residual conformations) also showed a large variability depending on absorbed dose as well as postexposure time.
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EPR results indicated a longer lifetime for free radicals induced by lower doses compared with the radicals generated by higher ones. Mutual transformations of S-oxidized products into cysteic acid appeared to be faster than those in dry and degreased wool assuming that the present humidity inside the fibres is decisive as an oxygen source. Reactive products such as S-sulfonate, cystine monoxide, cystine dioxide, cysteic acid, disulphides, and carboxylates displayed a considerable fluctuation in quantity depending on both the absorbed dose and time. The aim was to determine whether preexposure treatment of the wool, as well as postexposure time, affects the properties of the irradiated wool. Time variations of the wool structure were measured using FTIR, Raman, and EPR spectroscopy. Wool scoured in tap water with no special degreasing and containing a balanced humidity responding to usual laboratory conditions was irradiated by accelerated electron beam in the range of 0–350 kGy dose.