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Synthesis, characterization and electrorheological properties of biodegradable chitosan/bentonite composites

Published online by Cambridge University Press:  09 July 2018

M. Cabuk ,
M. Yavuz ,
H. I. Unal  and
O. Erol
M. Cabuk*
Affiliation:
Muş Alparslan University, Faculty of Sciences and Arts, Department of Chemistry, Muş 49100, Turkey Suleyman Demirel University, Faculty of Sciences and Arts, Department of Chemistry, Isparta 32260, Turkey
M. Yavuz
Affiliation:
Suleyman Demirel University, Faculty of Sciences and Arts, Department of Chemistry, Isparta 32260, Turkey
H. I. Unal
Affiliation:
Gazi University, Department of Chemistry, Smart Materials Research Lab., Ankara 06500, Turkey
O. Erol
Affiliation:
Gazi University, Department of Chemistry, Smart Materials Research Lab., Ankara 06500, Turkey
*
*E-mail: [email protected]
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Abstract

Biodegradable chitosan/bentonite composites with three different compositions were synthesized by the intercalation method using cetyltrimethylammonium bromide as the cationic surfactant. The composites were characterized using conductivity, density, particle size measurements, FTIR, TGA, XRD and SEM methods. Colloidal stabilities of the suspensions prepared in silicone oil (SO) were observed to increase with decreasing density. The effects of dispersed particle concentration, shear rate, electric field strength, electric field frequency and temperature on the electrorheological (ER) activities of the suspensions were investigated. The electric field viscosities of the suspensions showed typical shear thinning non-Newtonian viscoelastic behaviour. Yield stresses of the suspensions were observed to change in proportion to the square of applied electric field (E). Further, according to creep and creep-recovery analysis, reversible viscoelastic deformations were observed in the suspensions under E ≠ 0 kV mm–1.

Keywords

bentoniteclay/polymer compositeelectrorheologycolloidal stability.
Type
Research Article
Information
Clay Minerals , Volume 48 , Issue 1 , March 2013 , pp. 129 - 141
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

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