ビニルトリエトキシシランによる酸化チタンのカップリング処理 Coupling Treatment of TiO_2 Pwoders with Venyltriethoxysilane

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To obtain fundamental findings on providing an inorganic substrate with hydrophobic properties using a silane coupling agent by the dry method, which is often limited by an uneven product, a fundamental study was performed using TiO<sub>2</sub> and a vinyltriethoxysilane (VTES) system. The hydrophobicity afforded by VTES treatment were determined as a function of parameters such as the VTES/EtOH/Aq.CH<sub>3</sub>COOH ratio, pH of aqueous phase, duration of pretreatment with VTES solution, H<sub>2</sub>O/VTES ratio and heat treatment temperature of VTES treated product. It was found that the molar ratio of H<sub>2</sub>O/VTES, pH of aqueous phase, pretreatment duration of VTES solution, and heat treatment temperature are important parameter to determine coupling effect.<br>The principal findings obtained are as follows.<br>1. Optimum treatment of TiO<sub>2</sub> can be achieved using VTES solution containing a stoichiometric amount of H<sub>2</sub>O at aqueous phase pH 3.3 after storing for more than 36hrs.<br>2. The pH value in the aqueous phase is intimately related to hydrolysis and condensation reactions of VTES, and thus to the hydrophobic properties of TiO<sub>2</sub> treated with VTES solution.<br>3. Heat treatment of TiO<sub>2</sub> powders treated with VTES is essential to provide a hydrophobic property to TiO<sub>2</sub>. However an excessively high temperature causes evaporation of hydrolysis and condensation products of VTES, resulting in poor hydrophobicity.<br>4. The required amount of VTES can be calculated by applying a closed packing model of VTES to the TiO<sub>2</sub> substrate.

収録刊行物

  • 表面技術 = The Journal of the Surface Finishing Society of Japan  

    表面技術 = The Journal of the Surface Finishing Society of Japan 50(1), 84-89, 1999-01-01 

    The Surface Finishing Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002111666
  • NII書誌ID(NCID)
    AN1005202X
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09151869
  • NDL 記事登録ID
    973629
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-291
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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