ハロゲン化ブチル/天然ゴムブレンドの動的加硫

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タイトル別名
  • Dynamic Vulcanization of Halogenated Butyl Rubber/Natural Rubber Blend
  • ハロゲンカ ブチル テンネン ゴムブレンド ノ ドウテキカリュウ

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説明

Tubeless tire has the innerliner for air impermeable layer for which butyl rubbers are often used. Butyl rubbers hardly adhere to the other tire components consisting of diene rubber compounds, e.g. blends of natural rubber, styrene-butadiene rubber and butadiene rubber. To solve this problem, the blend method of butyl rubber and diene rubber was proposed: however the adhesion has not been improved to a desired level.<br>In this article, we applied dynamic vulcanization for halogenated butyl rubber/natural rubber blend and successfully accomplished high adhesive strength (three times) without sacrificing the low air permeability. By transmission electron microscopy (TEM) and atomic force microscopy (AFM) analyses, the high adhesive strength was shown to be achieved by a unique morphology of butyl rubber-rich particles in the NR-rich matrix which is faced to diene rubber layer. The partial miscibility seems to be caused by a shear-dependent phase dissolution under high shear fields during dynamic vulcanization and succeeding phase decomposition. The dissolution-decomposition mechanism was supported by the development of regularly separated texture with periodic distance of sub-, um as observed by TEM and scanning electron microscopy (SEM) and the gradual change in concentration profile as revealed by AFM, both of which are characteristic to the spinodal decomposition; i.e., phase decomposition from single-phase mixture.

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