金属アルコキシドを原料とするゾル・ゲル法によるガラスの製造　　Ｓｉ（ＯＣ２Ｈ５）４の加水分解途上で生成するシロキサンポリマの形態

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タイトル別名
  • Preparation of Oxide Glasses from Metal Alkoxides by Sol-Gel Method
  • キンゾク アルコキシド オ ゲンリョウ ト スル ゾル ゲルホウ ニ ヨル ガ
  • Si(OC<sub>2</sub>H<sub>5</sub>)<sub>4</sub>の加水分解途上で生成するシロキサンポリマーの形態

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The type or shape of the polymers produced in the course of hydrolysis of silicontetraethoxide Si(OC2H5)4 has been investigated. Four solutions in the Si(OC2H5)4-H2O-C2H5OH-HCl system were prepared. In those solutions the molar ratios of water to Si(OC2H5)4, r, were 1.0, 2.0, 5.0 and 20.0, respectively, while the ratio of HCl to the alkoxide was kept constant at 0.01. The polymerized products or siloxane polymers were trimethylsilylated and subjected to the measurements of number-average molecular weight Mn and intrinsic viscosity [η]. Based on the relation between Mn and [η], namely, [η]=KMna where K and a are constants, type of the siloxane polymer was discussed. The exponent a's for solutions with r's of 1.0 and 2.0 were 0.75 and 0.64, respectively, showing that linear polymers are produced in those solutions. The exponent a for the solution with r of 20.0 was 0.34, corresponding to the three-dimensional or spherical polymer. Intermediate value of a was obtained for the solution with r of 5.0. These results corresponded with the authors' previous assumption that the occurrence of spinnability in a Si(OC2H5)4 solution containing a small amount of water is closely related to the formation of linear polymers in the course of hydrolysis.

収録刊行物

  • 窯業協會誌

    窯業協會誌 92 (1065), 242-247, 1984

    公益社団法人 日本セラミックス協会

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