Abstract
The fiber structure of domestic (Bombyx mori) and wild (Antheraea pernyi, Antheraea assama and Anteraea yamamai) silk fibers was investigated by measuring X-ray diffraction of tin-treated specimens of these silk fibers. The wide angle X-ray diffraction analysis suggested that when the fraction of stannic acid gel (SnO2•H20) in fiber exceeded 10%, crystallites in the fiber became destroyed. While the small angle X-ray scattering analysis sug-gested that more stannic acid gel was fixed in microvoids of the domestic fiber than in those of the wild silk fibers. It was also suggested that there were more gel particles which were unablc to be detected by means of the small angle X-ray scattering in the wild silk fibers that in the domestic silk fiber. These particles were considered to be fixed in space surrounded by fibrils; the fibrils would be separated with more space in the former.
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