Abstract
The origin of the small angle x-ray diffraction peak obtained from vulcanized rubber samples has been investigated in detail. The changes in the small angle x-ray diffraction peak, which are caused by such treatments on vulcanized rubber samples as swelling, stretch-relaxation, heat and extraction, have been measured. In addition to these, the examination of the effect of compound ingredients on small angle x-ray diffraction has been made. Taking the analytical results of the extract into consideration, it has been cocluded that the small angle x-ray diffraction peak obtained from vulcanized rubber samples is caused by the reaction product during vulcanization, which is basicaly zinc stearate, and that the peak is not related to sulfur cross-links directly. This leads us to consider that it would be necessarly to reconsider the "B phase (collectively cross linked rubber phase)" in the "Heterogeneous model of rubbers", which is experimentaly supported by the existence of a small angle x-ray diffraction peak.
