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New approach to wool phase structure
Jakšić, Danilo
Wool fibres were stretched approximately 120 % with speed of 0,63 %/minute in boiling water. Diffractograms were taken at certain intervals and the degree of crystallinity in dependence of percentage ...of streching was calculated, simultaneously. In case of virgin wool, 57.2 % degree of crystallinity was attained. Approximately 40 % degree of crystallinity can be ascribed to alpha phase (alpha phase has lower density than beta phase) while approximately 17.2 % originate from beta phase that was not transformed into alpha phase during wool fibre growth process. It was very difficult to stretch wool fibres more than 110 %. At a stretch of 120 % more than 60 % of fibres in the bundle were broken. It may be supposed that alpha crystallinity phase does notexist any more at 120 % of stretching. This supposition is supported by experimental results as the crystallinity degree at 120 % of stretching is 39.3 %. This means that 22.1 % of beta phase was newly formed from molecules in the conglomerate with molecules that incorporate the residua of aromatic aminoacids and cystine (about 20.7 %). X-ray picture with no equatorial reflex at 0.465 nm can be explained by relatively small quantity of beta phase, by low orientation as well as by the fact, that reflex is covered by diffuse ring at approximately 0.46 nm.
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