ケイ酸塩のケイ酸重合形態(第3報)アルミノケイ酸ナトリウムゲルの調製条件および加熱による重合ケイ酸基の形態分布変化

概要

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The polymeric forms of silicic acid in sodium aluminosilicate gel were studied by the trimethylsilylation method. Anions such as SiO_4^<4->, Si_2O_7^<6->, Si_3O_<10>^<8->, Si_4O_<12>^<8->, Si_6O_<17>^<10->, soluble polysilicic acids expressed as Si_<2n>O_<5n+2>^<2 (n+2)->, and insoluble steric network polysilicic acids were found to be present in the gel. The composition of these polysilicic acids was remarkably affected by the kind and concentration of sodium silicate, reaction temperature, and SiO_2/Al_2O_3 ratio. Further, the gel structure of sodium aluminosilicate varies with calcination temperature. Condensation among soluble polysilicic acids occurs at 200-400°, and the growth of siloxane bond with destruction of metallsiloxane bond occurs at the temperature range over 400°.
公益社団法人日本薬学会の論文
1978-12-25