Initial Stage Polymerization of Silicic Acid in Aqueous Solution

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  • SIGA Hiroshi
    Department of Industrial Chemistry, School of Engineering, Tokai University
  • Higuchi Masashi
    Department of Industrial Chemistry, School of Engineering, Tokai University
  • AZUMA Yasuo
    Department of Industrial Chemistry, School of Engineering, Tokai University

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Other Title
  • ケイ酸の水溶液中での初期重合過程
  • ケイサン ノ スイヨウエキチュウ デ ノ ショキ ジュウゴウ カテイ

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Abstract

The initial stage polymerization of silicic acid in aqueous solution was investigated by using a monosilicic acid solution prepared from hydrolysis of TMOS (Tetra-methyle-silicate).<BR>Results obtained were as follows.<BR>1) The silicic acid concentration in aqueous solution by ion resin method of sodium silicates decreased rapidly.<BR>2) The silicic acid solution prepared from the hydrolysis of TMOS was stable on standing at 25°C. The rate of initial stage polymerization can be applied of the second-order reaction equation. Its initial stage polymerization were distinguished for three step in acid solution, and for two step in alkaline solution. The rate of polymerizationin alkaline solution proceeded greatly than this of in acid solution.<BR>3) The activation energies for polymerization were 26.4 kcal/mol in water, 9.5 kcal/mol in acid solution.<BR>From these results, it was found that the polymerization took place in a different mechanism by acid solution and alkaline solution, and formed +H2OSi (OH) 3 in acid solution, (HO) 3SiO- in alkaline solution.

Journal

  • Inorganic Materials

    Inorganic Materials 4 (268), 223-231, 1997

    The Society of Inorganic Materials, Japan

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