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Clays and Clay Minerals

, Volume 27, Issue 6, pp 429–432 | Cite as

Formation of Polymeric Species in the Interlayer of Bentonite

  • J. C. Bart
  • F. Cariati
  • L. Erre
  • C. Gessa
  • G. Micera
  • P. Piu
Article

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.

Key Words

Bentonite Hydrophobic Infrared spectroscopy Interlayer Polymerization 

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

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

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.

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Copyright information

© The Clay Minerals Society 1979

Authors and Affiliations

  • J. C. Bart
    • 1
  • F. Cariati
    • 2
  • L. Erre
    • 2
  • C. Gessa
    • 3
  • G. Micera
    • 2
  • P. Piu
    • 2
  1. 1.Montedison “G. Donegani” Research LaboratoriesNovaraItaly
  2. 2.Istituto di Chimica GeneraleUniversità di SassariItaly
  3. 3.Istituto di Chimica AgrariaUniversità di SassariItaly

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