充てん剤系加硫ゴムの伸張による分子配向

概要

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It is concluded from NMR, X-ray and other experimental results, that the rubber molecules of vulcanized fillers-in form three different phases, the unmotional, the collectively cross-linked, and the micro-Brownian motional, phase. And it is considered from the view point of molecular mobility that vulcanizates used as fillers-in form heterogenious structure. In the present experiment, we mixed a little amount of ZnO (needle-shaped crystals) in unvulcanized fillers-in, and made X-ray investigations of the orientation of ZnO atoms and the rubber crystals generated in the process of extension. The results are as follows : (1) The rubber molecules in the highly motional phase are quickly orientated by extension, but those of the unmotional and collectively cross-linked phases are slowly orientated to show non linear movement. (2) Non linear movement of the unmotional phase is influenced greatly by the type of cross-link with sulfur ; the less the number of sulfur atom in the sulfide cross-linkages, the less non linear character is. This is attributed to the restraint of the movement of the rubber molecules in the unmotional phase due to the sulfide cross-linkages.
社団法人日本材料学会の論文
1966-05-15