The Interaction Between N-Isopropylacrylamide-Acrylic Acid-Ethyl Methacrylate Thermosensitive Polymers and Cationic Surfactants

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dc.contributor.authorde Oliveira Tiera, Vera Aparecida [UNESP]
dc.contributor.authorTiera, Marcio Jose
dc.contributor.authorBlaz Vieira, Neide Aparecida
dc.contributor.authordo Amaral, Bruno Rochetti
dc.contributor.authorPires, Rogerio Zambelli
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T14:03:10Z
dc.date.available2014-05-20T14:03:10Z
dc.date.issued2009-01-01
dc.description.abstractThe interaction between cationic surfactants and isopropylacrylamide-acrylic acid-ethyl methacrylate (IPA:AA:EMA) terpolymers has been investigated using steady-state fluorescence and spectrophotometric measurements to assess the effect of the polymer composition on the aggregation process and terpolymers' thermosensitivities. Micropolarity studies using pyrene show that the interaction of cationic surfactants with IPA:AA:EMA terpolymers occurs at surfactant concentrations much smaller than that observed for the pure surfactant in aqueous solution. The critical aggregation concentration (CAC) values decrease with both the hydrocarbon length of the surfactant and the content of ethyl methacrylate. These results were interpreted as a manifestation of the increasing contribution of attractive hydrophobic and electrostatic forces between negatively charged polymer chains and positively charged surfactant molecules. The increase of ethyl methacrylate in the copolymers lowers the CAC due to the larger hydrophobic character of the polymer backbone. The cloud point determination reveals that the lower critical solution temperatures (LCST) depend strongly on the copolymer composition and surfactant nature. The binding of surfactants molecules to the polymer chain screens the electrostatic repulsion between the carboxylic groups inducing a conformational transition and the dehydration of the polymer chain.en
dc.description.affiliationSão Paulo State Univ, Chem & Environm Sci Dept, IBILCE, UNESP, BR-15054000 Sao Jose do Rio Preto, SP, Brazil
dc.description.affiliationUnespSão Paulo State Univ, Chem & Environm Sci Dept, IBILCE, UNESP, BR-15054000 Sao Jose do Rio Preto, SP, Brazil
dc.format.extent1121-1128
dc.identifierhttp://dx.doi.org/10.1080/01932690802701499
dc.identifier.citationJournal of Dispersion Science and Technology. Philadelphia: Taylor & Francis Inc, v. 30, n. 8, p. 1121-1128, 2009.
dc.identifier.doi10.1080/01932690802701499
dc.identifier.issn0193-2691
dc.identifier.lattes8796747160088337
dc.identifier.urihttp://hdl.handle.net/11449/22259
dc.identifier.wosWOS:000268707100001
dc.language.isoeng
dc.publisherTaylor & Francis Inc
dc.relation.ispartofJournal of Dispersion Science and Technology
dc.relation.ispartofjcr1.454
dc.relation.ispartofsjr0,375
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectCationic surfactantsen
dc.subjectFluorescenceen
dc.subjectisopropylacrylamideen
dc.subjectpolyelectrolyteen
dc.subjectthermosensitiveen
dc.titleThe Interaction Between N-Isopropylacrylamide-Acrylic Acid-Ethyl Methacrylate Thermosensitive Polymers and Cationic Surfactantsen
dc.typeArtigo
dcterms.licensehttp://journalauthors.tandf.co.uk/permissions/reusingOwnWork.asp
dcterms.rightsHolderTaylor & Francis Inc
unesp.author.lattes8796747160088337
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências Letras e Ciências Exatas, São José do Rio Pretopt

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