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Adsorption of Polyetheramines on Montmorillonite at High pH

DOI: 10.1021/la103278v DOI Help

Authors: Yannan Cui (University of Bristol) , Jeroen Van Duijneveldt (University of Bristol)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Langmuir , VOL 26 (22)

State: Published (Approved)
Published: October 2010

Abstract: Adsorption of a series of polyetheramines on montmorillonite in aqueous suspension was investigated by a range of methods: elemental analysis, atomic absorption spectroscopy, measurement of pH, conductivity and electrophoretic mobility, and small-angle X-ray scattering. Adsorption proceeds through an ion exchange mechanism. The maximum surface coverage attained is equivalent to about 40% of the cationic exchange capacity of the clay. Adsorption of the poly(oxypropylene) block adjacent to the amine group onto the clay surface may contribute to this. Surprisingly the adsorption takes place at pH conditions well above the pKa of the amine surfactants, where they are not protonated in the bulk solution. The surface coverage as a function of molar mass broadly agrees with predictions assuming adsorbed polymers adopt a densely packed mushroom configuration at the clay surface.

Subject Areas: Chemistry

Instruments: I22-Small angle scattering & Diffraction