Isothermal calorimetric investigation of the interaction of poly(N-isopropylacrylamide) and ionic surfactants

dc.creatorLoh, W
dc.creatorTeixeira, LAC
dc.creatorLee, LT
dc.date2004
dc.date40603
dc.date2014-11-17T12:12:19Z
dc.date2015-11-26T17:37:29Z
dc.date2014-11-17T12:12:19Z
dc.date2015-11-26T17:37:29Z
dc.date.accessioned2018-03-29T00:19:09Z
dc.date.available2018-03-29T00:19:09Z
dc.identifierJournal Of Physical Chemistry B. Amer Chemical Soc, v. 108, n. 10, n. 3196, n. 3201, 2004.
dc.identifier1520-6106
dc.identifierWOS:000220093900013
dc.identifier10.1021/jp037190v
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/60875
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/60875
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/60875
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1285973
dc.descriptionThe interaction of poly(N-isopropylacrylamide) (PNIPAM) with an anionic (SDS) and three cationic (dodecyl and hexadecyltrimethylammonium bromides, DTAB and CTAB, and dodecylammonium chloride, DAC) surfactants has been studied using isothermal titration calorimetry between 17 and 29 degreesC. The high sensitivity of this technique allows precise determination of the parameters that characterize polymer-surfactant interactions. Based on these results, it is possible to conclude that the interaction of PNIPAM with ionic surfactants is significantly affected by temperature. This is attributed to changes in polymer hydration, which become more important near the lower critical solution temperature (approximate to32 degreesC). Interaction of PNIPAM with SDS is more favorable than with cationic surfactants. Surfactant hydrophobicity is also an important factor for this interaction, with CTAB displaying a more intense interaction than DTAB. The contribution from the size of the headgroup was also investigated: DAC interacts more strongly than DTAB with PNIPAM. Thus, for the same degree of hydrophobicity, a smaller headgroup favors interaction.
dc.description108
dc.description10
dc.description3196
dc.description3201
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.subjectSodium Dodecyl-sulfate
dc.subjectPoly-n-isopropylacrylamide
dc.subjectAqueous-solution
dc.subjectTitration Calorimetry
dc.subjectCationic Surfactants
dc.subjectGlobule Transition
dc.subjectUncharged Polymers
dc.subjectViscosity
dc.subjectWater
dc.subjectTemperature
dc.titleIsothermal calorimetric investigation of the interaction of poly(N-isopropylacrylamide) and ionic surfactants
dc.typeArtículos de revistas


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