ゾル-ゲル法によるスチレン-ブタジエン共重合ゴムのin situシリカ補強-1-

概要

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In situ silica reinforcement of styrene-butadiene rubber (SBR) was carried out by the sol-gel process using tetraethoxysilane (TEOS). SBR was sulfur-cured, and subjected to welling in tetrahydrofuran and soaking in TEOS with or without catalyst in the presence of small amount of water. The catalyst used was n-butylamine or hydrochloric acid. The swollen vulcanizates were kept at 50°C to conduct the sol-gel reaction of TEOS in the rubber matrix. The resulting vulcanizates were silica stocks by in situ filling technique, and were subjected to the tensile measurement. Increase of modulus and tensile strength at break was recogneized, which suggests inclusion of silica particles in the vulcanizates. The reinforcement effect of in situ silica was highest when n-butylamine was used as a catalyst. This method of filler compounding is promising for diene rubbers as well as for silicone elastomers.