ゴム粉〜マトリックスゴム界面近傍での硫黄移行現象と自由体積の不連続性-1-

概要

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Physical properties of vulcanizates containing comminuted vulcanizates show linear and nonlinear dependence on the volume fraction of comminuted vulcanizates. One of the reasons for the linear dependence has been assumed to be due to discontinuity of free volume distribution at the interface caused by transport of sulfur from the matrix to the comminuted vulcanizates through diffusion and chemical reaction.The transport phenomena of sulfur have been studied by X-ray microprobe analysis (XMA) and freezing point depression of solvent for a model specimen with layered vulcanized rubber and unvulcanized rubber filled with curatives. The results show evidence of the transport of sulfur from the unvulcanized rubber to the vulcanized rubber after curing and a corresponding high crosslink density in the vulcanized rubber or comminuted vulcanizates. There is a sharp discontinuity in the crosslink density or free volume near the interface between unvulcanized and vulcanized rubber after curing.
日本ゴム協会の論文