Abstract
A series of events takes place as wool is heated under vacuum from room temperature to 250 degrees C: Loosely and strongly bound water molecules are removed at temperature at and below 150 degrees C; a glass transition of the amorphous keratin occurs at 160-175 degrees C; helices melt at 215 and 235 degrees C. The structural changes take place between the glass transition and the helix melting temperature are observed as reflected in the low-angle X-ray diffraction patterns: The 39 A meridional reflection is intensified; a 4-point diagram at azimuthal angle of 45 degree with spacing around 46 A appears; the intensity of the 33 A meridional reflection decreases, and the 66 A meridional reflection is the most heat-resistant.
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