Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/200860
Type: Artigo de periódico
Title: Self-assembly Of Complex Salts Of Cationic Surfactants And Anionic-neutral Block Copolymers. Dispersions With Liquid-crystalline Internal Structure.
Author: Vitorazi, Letícia
Berret, Jean-François
Loh, Watson
Abstract: We report the synthesis of complex salts made from the cationic surfactant dodecyltrimethylammonium and diblock copolymers poly(acrylic acid)-block-poly(acrylamide) of different molecular weights. In water, the complex salts self-assemble into stable hierarchical aggregates with a dense core and a diffuse shell. In contrast to earlier reports, the surfactant/polymer aggregates exhibit a liquid crystalline structure of Pm3n cubic symmetry. The crystal structure is analogous to that obtained with homopolymer. Size and aggregation numbers were estimated from a combination of light and small-angle X-ray scattering experiments. It is found that the size of the aggregates decreases with increasing diblock asymmetry. The complex salt methodology presents many advantages, among which to be insensitive to the preparation conditions and to the mixing pathway.
Rights: fechado
Identifier DOI: 10.1021/la402624u
Address: http://www.ncbi.nlm.nih.gov/pubmed/24151925
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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