Artículos de revistas
Polyion-surfactant Ion Complex Salts Formed By A Random Anionic Copolyacid At Different Molar Ratios Of Cationic Surfactant: Phase Behavior With Water And N -alcohols
Registro en:
Journal Of Physical Chemistry B. American Chemical Society, v. 116, n. 8, p. 2376 - 2384, 2012.
15206106
10.1021/jp2103403
2-s2.0-84857737782
Autor
Percebom A.M.
Piculell L.
Loh W.
Institución
Resumen
The presence of acid groups with different pKa values in the anionic copolymer poly(4-styrene sulfonic acid-co-maleic acid), P(SS-Ma), allowed the preparation of complex salts with a variable fraction of anionic groups neutralized by cationic surfactant in the copolymer via controlled titration with hexadecyltrimethylammonium hydroxide, C16TAOH. Two new complex salts were selected for detailed phase studies, C16TA 2P(SS-Ma) and C16TA3P(SS-Ma), where both had 100% charged styrene sulfonate groups, but the fraction of charged carboxylate groups on the polyion was 50% or 100%, respectively. These complex salts thus contained both hydrophobic (styrene sulfonate) and hydrophilic (carboxylate) charged groups, and the ratio between the two could be altered by titration. These features were found to have consequences for the phase behavior in water and in ternary mixtures with water and n-alcohols for the two complex salts, which differed compared to complex salts containing homo- or copolyions with only carboxylate or styrene sulfonate charged groups. For both complex salts, binary mixtures with water produced, in the dilute region, two isotropic phases in equilibrium, the bottom (concentrated) one displaying increasing viscosity with increasing concentration. For the complex salt C16TA 2P(SS-Ma), there was evidence of micellar growth to form anisometric aggregates at high concentrations. For the C16TA3P(SS-Ma) complex salt, this was not observed, and the isotropic phase was followed by a narrow region of cubic phase. In both cases, concentrations above ca. 60 wt % produced a hexagonal phase. 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