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Article Dans Une Revue Soft Matter Année : 2013

One and two dimensional self-assembly of comb-like amphiphilic copolyelectrolytes in aqueous solution

Résumé

The spontaneous self-assembly of a novel comb-like amphiphilic copolyelectrolyte in water was studied by small angle neutron scattering and freeze fracture transmission electron microscopy. The copolymer was synthesized by randomly grafting pendant quaternized alkylamine moieties to a poly(styrene) chain. The effects of the grafting density and the length of the alkyls (C12-C18) on the structure were investigated systematically. The polymers were soluble over a broad range of grafting densities (35-80 mol%) where they assembled either into lamellae (35-55 mol%) consisting of a double layer of polymers or cylinders (65-80 mol%) formed by bundling of several chains. At higher concentrations, electrostatic repulsion drove smectic and hexagonal ordering of, respectively, the lamellae and the rods. TEM images showed micro-domains of stacked lamellae that were in some cases closed upon themselves to form onion-like particles. Exposure of hydrophobic patches at the surface due to defects of the self-assembly led to the formation of bonds between lamellae or cylinders. As a consequence visco-elastic solutions or hydrogels were formed at higher concentrations.
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Dates et versions

hal-02470753 , version 1 (07-02-2020)

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C. Limouzin-Morel, Fabien Dutertre, W. Moussa, C. Gaillard, I. Iliopoulos, et al.. One and two dimensional self-assembly of comb-like amphiphilic copolyelectrolytes in aqueous solution. Soft Matter, 2013, 9 (37), pp.8931. ⟨10.1039/c3sm51895g⟩. ⟨hal-02470753⟩
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