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Synthesis of the Trimethylsilylation Derivative of Halloysite

Published online by Cambridge University Press:  01 July 2024

Kazuyuki Kuroda  and
Chuzo Kato
Kazuyuki Kuroda
Affiliation:
Department of Applied Chemistry, School of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo, Japan 160
Chuzo Kato
Affiliation:
Department of Applied Chemistry, School of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo, Japan 160
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Abstract

The trimethylsilyl derivative from halloysite was prepared by the reaction of halloysite powder with a trimethylsilylating reagent. The product was organophilic and the results of its infrared spectrum, X-ray powder diffraction pattern, and elemental analysis indicated that the trimethylsilylation occurred on silanol groups in the tetrahedral layer of halloysite after the acid decomposition of the octahedral layer. The thermal stability of the product was evaluated by means of differential thermal analysis. It was not possible to obtain the organic derivative from kaolinite by the same procedure. It is suggested that the differences in the reactivity between halloysite and kaolinite is due to the difference in susceptibility of the clay minerals to acid attack.

Резюме

Резюме

Триметилсилил, дериват галлуазита, был получен реакцией порошка галлуазита с триметилсилиловым реагентом. Продукт реакции был органофильным и результаты ис-следований его инфракрасного спектра, диаграмм порошкового метода рентгеноструктур-ного анализа и элементный анализ указывают, что триметилсилилизация происходила в силаноловых группах в тетраэдрическом слое галлуазита после кислотного разложения октаэдрического слоя. Термальная стабильность продукта была оценена посредством дифференциального термального анализа. Органический дериват каолинита не мог быть получен с помощью аналогичной процедуры. Повидимому, различие в реактивности гал-луазита и каолинита можно приписать различию в чувствительности глинистых минера-лов к воздействию кислоты.

Kurzreferat

Kurzreferat

Das Trimethylsilylderivat des Halloysit wurde durch Reaktion von Halloysitpulver mit einem Trimethylsilylierungsreagens präpariert. Das Produkt war organophil und die Resultate seines Infrarotspektrums, Röntgenpulverdiagrammes und elementare Analyse deuteten an, daß die Trimethylslilylierung an Silanolgruppen in der tetrahedrischen Schicht des Halloysit nach Säuredekomposition der oktahedrischen Schicht vorkommt. Die thermische Stabilität des Produkts wurde mit differentialer thermischer Analyse ermittelt. Das organische Derivat des Kaolinit, hergestellt in derselben Weise, konnte nicht erhalten werden. Es scheint, daß der Unterschied in der Reaktivität zwischen Halloysit und Kaolinit auf den Unterschied in der Anfälligkeit der Tonmineralien für den Säureangriff zurückzuführen ist.

Résumé

Résumé

Le dérivatif triméthylsilyl de l'halloysite a été préparé par réaction de poudre d'halloysite avec un agent réactif triméthylsilylatant. Le produit était organophyllique et les résultats obtenus de son spectre infrarouge, des diagrammes de diffraction aux rayons-X, et de l'analyse de l’élément ont indiqué que la triméthylsilylation s'est passée sur des groupes silanol dans les feuillets tétraédriques de l'halloysite après la décomposition acide du feuillet octaédrique. La stabilité thermale du produit a été évaluée au moyen d'une analyse thermique différentielle. Le dérivatif organique de kaolinite par le même procédé n'a pas pu être obtenu. Il semble que la différence de réactivité entre l'halloysite et la kaolinite est attribuable à une différence de susceptiblité des minéreaux argileux l'attaque acide.

Keywords

HalloysiteKaoliniteSynthesisTrimethylsilylation
Type
Research Article
Information
Clays and Clay Minerals , Volume 27 , Issue 1 , February 1979 , pp. 53 - 56
Copyright
Copyright © 1979, The Clay Minerals Society

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