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

dc.creatorPercebom, AM
dc.creatorPiculell, L
dc.creatorLoh, W
dc.date2012
dc.date36951
dc.date2014-07-30T18:09:48Z
dc.date2015-11-26T17:44:16Z
dc.date2014-07-30T18:09:48Z
dc.date2015-11-26T17:44:16Z
dc.date.accessioned2018-03-29T00:26:25Z
dc.date.available2018-03-29T00:26:25Z
dc.identifierJournal Of Physical Chemistry B. Amer Chemical Soc, v. 116, n. 8, n. 2376, n. 2384, 2012.
dc.identifier1520-6106
dc.identifierWOS:000300911900005
dc.identifier10.1021/jp2103403
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/70691
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/70691
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1287828
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionThe presence of acid groups with different pK(a) 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, C(16)TAOH. Two new complex salts were selected for detailed phase studies, C(16)TA(2)P-(SS-Ma) and C(16)TA(3)P(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 C(16)TA(2)P(SS-Ma), there was evidence of micellar growth to form anisometric aggregates at high concentrations. For the C(16)TA(3)P(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. For ternary mixtures with n-alcohols, the general trend was that a short-chain alcohol such as n-butanol acted as a cosolvent dissolving the aggregates, whereas with n-decanol, a cosurfactant effect was observed, inducing the formation of lamellar phases. Visual inspection (also between crossed polarizers), small angle X-ray scattering (SAXS) and diffusion nudear magnetic resonance (NMR) were used in these studies.
dc.description116
dc.description8
dc.description2376
dc.description2384
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionBrazilian Synchrotron Laboratory, LNLS
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.languageen
dc.publisherAmer Chemical Soc
dc.publisherWashington
dc.publisherEUA
dc.relationJournal Of Physical Chemistry B
dc.relationJ. Phys. Chem. B
dc.rightsfechado
dc.sourceWeb of Science
dc.subjectMixed Monovalent/polymeric Counterions
dc.subjectSymmetric Top Macromolecules
dc.subjectCircular-cylinders
dc.subjectAqueous-solution
dc.subjectChain-length
dc.subjectPolyelectrolyte
dc.subjectDiffusion
dc.subjectMixtures
dc.subjectSystems
dc.subjectCharge
dc.titlePolyion-Surfactant Ion Complex Salts Formed by a Random Anionic Copolyacid at Different Molar Ratios of Cationic Surfactant: Phase Behavior with Water and n-Alcohols
dc.typeArtículos de revistas


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