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Surface Chemistry of Thermally Decomposed Organo-Montmorillonite Complexes

Published online by Cambridge University Press:  01 July 2024

W. H. Slabaugh
W. H. Slabaugh*
Affiliation:
Department of Chemistry Oregon State University, Corvallis, Oregon 97330, U.S.A.
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Abstract

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The hydrophilic-hydrophobic properties of four thermally decomposed organoclays, the octadecylammonium-, the dimethylaryloctadecylammonium-, and the dimethyldioctadecylammonium-bentonites and the dimethyldioctadecylammonium-hectorite, were examined through adsorption isotherms with nitrogen, water vapor, and hexane. Along with DTA and TGA results, these clay complexes appear to undergo transitions from low to higher degrees of hydrophilicity as more and more of the hydrocarbon chains are dehydrogenated at successive temperatures up to 400°C.

Résumé

Résumé

On a examiné, en mesurant les isothermes d’adsorption de l’azote, de la vapeur d’eau et de l’hexane, les propriétés hydrophiles-hydrophobes de quatre complexes organiques de l’argile décomposés thermiquement: les montmorillonites-octadécylammonium, -diméthylaryloctadécylammonium et -diméthyldioctadécylammonium, et l’hectorite-diméthyldioctadécylammonium. Parallèlement aux résultats de l’ATP et de l’ATG, ces complexes argileux semblent subir une transformation du caractère hydrophile qui, de faible devient élevé, au fur et à mesure que les chaînes hydrocarbonées sont déshydrogénées par des élévations successives de la température jusqu’à 400°C.

Kurzreferat

Kurzreferat

Die hydrophil-hydrophoben Eigenschaften von vier thermisch abgebauten Organotonen, den Oktadecylammonium-, Dimethylarly-oktadecylammonium-, und Dimethyldioktadecyl-ammonium-Bentoniten und dem Dimethyldioktadecylammonium-Hektorit wurden untersucht durch Adsorptionsisotherme mit Stickstoff, Wasserdampf und Hexan. Mit den DTA und TG A Ergebnissen, scheinen diese Tonkomplexe Übergänge von niedrigen auf höhere Stufen von Hydrophilizität zu erfahren in dem Masse als mehr und mehr Kohlenwasserstoffketten bei steigenden Temperaturen bis zu 400°C dehydriert werden.

Резюме

Резюме

С помощью анализа изотерм адсорбции азота, водяного пара и гексана проведено исследование гидрофильных и гидрофобных свойств четырех термически разложенных орга-ноглин: октадециламмоний-, диметиларилоктадециламмоний-и диметилдиоктадециламмо-ний-бентонитов и диметилдиоктадециламмоний-гекторита. В соответствии с данными ДТА и ТГА, степень гидрофильности этих глинистых комплексов меняется от низкой к высокой по мере того как все большая и большая часть углеродоводородных цепей дегидрогенизируется при постепенном повышении температуры до 400°С.

Type
Research Article
Information
Clays and Clay Minerals , Volume 19 , Issue 3 , July 1971 , pp. 201 - 204
Copyright
Copyright © Pergamon Press 1971

References

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