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Time variation of wool structure under electron beam irradiation

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Document pages: 10 pages

Abstract: The wool washed in tap water is irradiated with an accelerated electron beam in the range of 0-350, without special degreasing, humidity balance, and in line with the usual laboratory conditions   kGy dose. The temporal changes of wool structure were measured by FTIR, Raman and EPR spectra. The purpose is to determine whether the pretreatment of wool and the time after exposure will affect the properties of irradiated wool. The amount of reaction products, such as S-sulfonate, cystine oxide, cystine dioxide, cystine, disulfide and carboxylate, fluctuates considerably according to the absorbed dose and time. The mutual conversion of S-oxidation products to cystine seems to be faster than that in dry and defatted wool, assumingsent humidity inside the fibres is decisive as an oxygen source. EPR results indicated a longer lifetime for free radicals induced by lower doses compared with the radicals generated by higher ones. 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. The most stable secondary structure was observed in nonirradiated wool but even this showed a small but observable change after a longer time, too.

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