Electrokinetic, electrorheological and viscoelastic properties of Polythiophene-graft-Chitosan copolymer particles

[Display omitted] •ζ-Potential of the PT dispersion increased after grafting with CS.•The pH, electrolytes and surfactants were found to be effective on ζ-potential of the dispersions.•ζ-Potentials of the materials in SO were found to be in the colloidal stability range and suitable for ER fluids.•Y...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2016-12, Vol.510, p.231-238
Main Authors: Cabuk, Mehmet, Yavuz, Mustafa, Unal, Halil Ibrahim
Format: Article
Language:English
Subjects:
Chitosan
Creep-recovery
Electrorheology
Polythiophene
Smart material
Zeta-potential
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Summary:[Display omitted] •ζ-Potential of the PT dispersion increased after grafting with CS.•The pH, electrolytes and surfactants were found to be effective on ζ-potential of the dispersions.•ζ-Potentials of the materials in SO were found to be in the colloidal stability range and suitable for ER fluids.•Yield stress of PT-g-CS increased with rising E and fitted to the conduction model.•PT-g-CS showed vibration damping capability and nonlinear recoverable viscoelastic deformation under various E and classified as a smart material. Electrokinetic properties of Polythiophene-graft-Chitosan (PT-g-CS) copolymer were investigated by means of zeta (ζ)-potential measurements as a function of pH, electrolytes, surfactants, and temperature in aqueous medium. The ζ-Potential of pure PT was observed to enhance from +25mV to +36mV after grating with polycationic CS. Concomitantly, the isoelectric point of the pure PT shifted from 6.4 to 8.3. The ζ-Potential of PT-g-CS dispersion also shifted to more positive regions with increasing valency of the electrolytes and concentrations of cationic surfactant (cetyltrimethylammonium bromide). The ζ-Potential of PT-g-CS was determined to be +38mV which indicated colloidal stability in silicone oil (SO) medium. Electrorheological (ER) and viscoelastic measurements revealed that the PT-g-CS/SO system has elasto-viscous behavior under applied electric field strengths. The yield stress of the ER fluid was determined to be a function of the electric field strength in a power law form as τy=E1.55 which obey to the conduction model. Creep and creep-recovery tests revealed reversible non-linear viscoelastic deformations of %31
ISSN:0927-7757
1873-4359
DOI:10.1016/j.colsurfa.2016.06.014