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Amphiphilic Diblock Copolymers: Adsorption and Wetting Modification

O. Theodoly, M. Jacquin, T. Futterer, P. Muller and M. Morvan
RHODIA, US

Keywords:
diblock copolymers, colloid, macrosurfactant

Abstract:
Using MADIX synthesis, we have developed a series of charged amphiphilic diblock copolymers acting as efficient macro-surfactants. Several chemistries for the hydrophobic block have been tested, differing by their degree of hydrophobicity, i.e. their interfacial tension versus water (from 3 mN/m to 35 mN/m). The self-assembling properties in solution (CMC values, aggregation structures and micelle/unimer exchange kinetics) were strongly dependent on this interfacial tension. The properties in solution had dramatic effect on the spontaneous adsorption behavior toward a hydrophobic interface: the most hydrophobic samples had the least affinity for hydrophobic interfaces. Unimer/micelle exchange kinetics in solution allowed explaining the adsorption kinetics. Finally, depending on the nature of the hydrophobic blocks, the systems change from colloid-like dispersions with no surface activity to macro-surfactant solutions with strong surface activity. The macro-surfactant systems were then tested as dispersion stabilizers and wetting modifiers. 

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