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Formation of Polymeric Species in the Interlayer of Bentonite

Published online by Cambridge University Press:  01 July 2024

J. C. Bart ,
F. Cariati ,
L. Erre ,
C. Gessa ,
G. Micera  and
P. Piu
J. C. Bart
Affiliation:
Montedison “G. Donegani” Research Laboratories, Via G. Fauser 4, Novara, Italy
F. Cariati
Affiliation:
Istituto di Chimica Generale, Università di Sassari, Italy
L. Erre
Affiliation:
Istituto di Chimica Generale, Università di Sassari, Italy
C. Gessa
Affiliation:
Istituto di Chimica Agraria, Università di Sassari, Italy
G. Micera
Affiliation:
Istituto di Chimica Generale, Università di Sassari, Italy
P. Piu
Affiliation:
Istituto di Chimica Generale, Università di Sassari, Italy
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Abstract

Infrared spectroscopic, X-ray powder diffraction, diffuse reflectance, and electron-spin resonance examination of homoionic bentonite from Sardinia treated with diazomethane indicates that poly-methylene was formed in the interlayer position. Polymerization can be attributed to the acidic properties of the residual water in the interlamellar space, depending on the nature of the exchanged ion. The presence of an interlayer polymer causes the clay to assume strong hydrophobic properties.

Резюме

Резюме

Гомоионный бентонит из Сардинии, обработанный диазометаном, изучался с помощью инфракрасной спектроскопии, порошкового метода рентгеноструктурного анализа, рассеянного отражения и электронноспинного резонанса. Было установлено, что полиметилен формируется в межслойных промежутках. Полимеризация связана с кислотными свойствами остаточной воды в межслойном пространстве, зависящими от природы обменного иона. Присутствие межслойного полимера обуславливает сильные гидрофобные свойства глины.

Resümee

Resümee

Untersuchungen mit Infrarotspektroskopie, Röntgenpulverdiffraktometrie, diffusem Reflexi-onsvermögen, und Elektronenspinresonanz an Bentonit von Sardinien, der nur eine Art von Kation hat und der mit Diazomethan behandelt wurde, zeigen die Bildung von Polymethylen in der Zwischenschichtposition. Die Polymerisation kann auf die sauren Eigenschaften des Restwassers im interlamellaren Zwischenraum zurückgeführt werden, die von der Art des ausgetauschten Ions abhängen. Die Anwesenheit von Zwischenschichtpolymeren ist die Ursache, daß der Ton stark hydrophobe Eigenschaften annimmt.

Résumé

Résumé

L'examen à la spectroscopic infra-rouge, à la diffraction aux rayons-X, à la réfléchissance diffuse, et à la résonance de spin d’électrons d'une bentonite homoionique de Sardaigne traitée au diazométhane indique que le polyméthylène à été formé dans la position intercouche. La polymérisation peut être attribuée aux propriétés acides de l'eau résiduelle dans l'espace interfeuillet, dépendant de la nature de l'ion échangé. L'argile prend des propriétés fortement hydrophobiques à cause de la présence d'un polymère intercouche.

Keywords

BentoniteHydrophobicInfrared spectroscopyInterlayerPolymerization
Type
Research Article
Information
Clays and Clay Minerals , Volume 27 , Issue 6 , December 1979 , pp. 429 - 432
Copyright
Copyright © 1979, The Clay Minerals Society

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