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Interlayer structure of organically modified montmorillonites: Effect of surfactant loading

Published online by Cambridge University Press:  03 March 2011

Qiang Zheng ,
Bo Xu ,
Yihu Song ,
Hongmei Yang  and
Yi Pan
Qiang Zheng*
Affiliation:
Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
Bo Xu
Affiliation:
Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
Yihu Song
Affiliation:
Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
Hongmei Yang
Affiliation:
Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
Yi Pan
Affiliation:
Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
*
a) Address all correspondence to this author. e-mail: zhengqiang@zju.edu.cn
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Abstract

The surfactant cetyltrimethylammonium ion (CTA+) was confined within the galleries of montmorillonite (MMT) to obtain a series of organo-montmorillonites (C16-MMTs) through an ion-exchange intercalation reaction. The C16-MMT formed a single precipitate layer when CTA+ loading was 18.3 wt% but stratified at high loadings. The conformational disorder increased with increasing CTA+ loading. The upper precipitate was characterized by a larger gallery height and a higher surfactant loading in comparison with lower precipitate. The confined methylene chains adopted a lateral monolayer with a small percentage of conformation freedoms at CTA+ loading of 18.3 wt%. The intercalated methylene chains were arranged either in a lateral monolayer or in a tilted interdigitated bilayer at CTA+ loading of 24.7 wt% while in either a tilted interdigitated bilayer or a lateral bilayer at high CTA+ loadings. The different arrangements of methylene chains intercalated in the MMT galleries are believed to be the reason for the stratification.

Keywords

IntercalatedIntercalationMicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 2 , February 2005 , pp. 357 - 363
Copyright
Copyright © Materials Research Society 2005

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