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We report the synthesis of complex salts made from the cationic surfactantdodecyltrimethyl-ammonium and diblock copolymers poly(acrylicacid)-block-poly(acrylamide) of different molecular weights. In water, thecomplex salts self-assemble into stable hierarchical aggregates with a densecore and a diffuse shell. In contrast to earlier reports, thesurfactant/polymer aggregates exhibit a liquid crystalline structure of Pm3ncubic symmetry. The crystal structure is analogous to that obtained withhomopolymer. Size and aggregation numbers were estimated from a combination oflight and small-angle x-ray scattering experiments. It is found that the sizeof the aggregates decreases with increasing diblock asymmetry. The complex saltmethodology presents many advantages, among which to be insensitive to thepreparation conditions and to the mixing pathway.

Self-assembly of complex salts of cationic surfactants and anionic-neutral block copolymers. Dispersions with liquid-crystalline internal structure