Thermodynamics of aggregation between the cationic aurfactant and polymer based on biodegradable poly(vinyl Alcohol)

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Autor(es): dc.creatorPatiño-Agudelo, Álvaro Javier-
Autor(es): dc.creatorBarbosa, Mylene Lourdes-
Autor(es): dc.creatorSilva, Luis Henrique Mendes da-
Autor(es): dc.creatorFerreira, Guilherme Max Dias-
Data de aceite: dc.date.accessioned2026-02-09T12:03:12Z-
Data de disponibilização: dc.date.available2026-02-09T12:03:12Z-
Data de envio: dc.date.issued2024-09-24-
Data de envio: dc.date.issued2024-09-24-
Data de envio: dc.date.issued2022-11-07-
Fonte completa do material: dc.identifierhttps://repositorio.ufla.br/handle/1/59490-
Fonte completa do material: dc.identifierhttps://doi.org/10.1021/acs.jpcb.2c05054-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1153296-
Descrição: dc.descriptionAs licenças de acesso aberto aplicáveis a este artigo estão em conformidade com as políticas do periódico em que foi publicado, disponíveis no link: https://v2.sherpa.ac.uk/id/publication/21299. Consulta realizada em 24 de set. de 2024.-
Descrição: dc.descriptionThe formation of aggregates between carboxylated (PVCOOH) or neutral hydrolyzed (PVOH) poly(vinyl alcohol) and hexadecylpyridinium chloride (C16PyCl) was examined by conductimetry, turbidimetry, and isothermal titration calorimetry (ITC) in the presence of different NaCl concentrations. The interaction between the polymers and C16PyCl in pure water showed a critical aggregation concentration (cac = 0.8 mmol L–1) only for the neutral polymer. PVCOOH interacted with the surfactant through electrostatic attraction, forming macroscopic aggregates. Integral enthalpy changes for aggregate formation (ΔHagg) obtained from ITC curves varied from −0.61 (for the PVOH system in pure water) to −4.14 kJ mol–1 (for PVOH in the presence of 10.0 mmol L–1 NaCl), indicating that the formation of the aggregates was enthalpically favored. However, hydrophobic interactions drove the process for low surfactant concentration for both polymers. Saturation concentrations (C2) obtained from conductimetry were smaller than those from ITC, revealing that the binding of C16PyCl on the chain of the polymers at higher surfactant concentrations shows the same electric properties as that of free micelles on the solution. Increase of the ionic strength favored the aggregation and decreased the complexity of the ITC curves, suggesting that the reorganization of the surfactant monomers on the polymeric chain with the increase in their concentration was suppressed.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languagept_BR-
Publicador: dc.publisherAmerican Chemical Society-
Direitos: dc.rightsAttribution-NoDerivatives 4.0 International-
Direitos: dc.rightsAttribution-NoDerivatives 4.0 International-
Direitos: dc.rightsacesso aberto-
Direitos: dc.rightshttp://creativecommons.org/licenses/by-nd/4.0/-
Direitos: dc.rightshttp://creativecommons.org/licenses/by-nd/4.0/-
???dc.source???: dc.sourceJournal of Physical Chemistry B-
Palavras-chave: dc.subjectPolímeros biodegradáveis-
Palavras-chave: dc.subjectÁlcool polivinílico-
Palavras-chave: dc.subjectSurfactantes catiônicos-
Palavras-chave: dc.subjectAgregação micelar-
Palavras-chave: dc.subjectCalorimetria de titulação isotérmica-
Palavras-chave: dc.subjectBiodegradable polymers-
Palavras-chave: dc.subjectPolyvinyl alcohol-
Palavras-chave: dc.subjectCationic surfactants-
Palavras-chave: dc.subjectMicelle aggregation-
Palavras-chave: dc.subjectIsothermal titration calorimetry-
Título: dc.titleThermodynamics of aggregation between the cationic aurfactant and polymer based on biodegradable poly(vinyl Alcohol)-
Tipo de arquivo: dc.typeArtigo-
Aparece nas coleções:Repositório Institucional da Universidade Federal de Lavras (RIUFLA)

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