Examination of the shape of wool fiber load-elongation curves obtained after a change in the rate of extension showed that each change produced new yield points. The sim ilarity between the normally occurring yield point and new yield points obtained in the region of creep shows that hydrogen bonds are elective throughout the whole process of the extension of the fibers. Treatment of the fibers with formic acid causes decay of the interaction of CO and NH groups, which is manifested by the lack of yield points and by complete return of the relaxed fibers to the initial state.
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