Density, Refractive Index, pH, and Cloud Point Temperature Measurements and Thermal Expansion Coefficient Calculation for PPG400, PE62, L64, L35, PEG400, PEG600, or PEG1000+ Water Systems

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Autor(es): dc.contributorUniversidade Estadual de Campinas (UNICAMP)-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorDe Oliveira, Leonardo H.-
Autor(es): dc.creatorPinto, Rafaela R.-
Autor(es): dc.creatorMonteiro Filho, Elias De S. [UNESP]-
Autor(es): dc.creatorAznar, Martín-
Data de aceite: dc.date.accessioned2022-08-04T22:10:34Z-
Data de disponibilização: dc.date.available2022-08-04T22:10:34Z-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2021-08-12-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1021/acs.jced.0c01092-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/222019-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/222019-
Descrição: dc.descriptionThermophysical properties and phase behavior of seven {polymer (1) + water (2)} systems were determined using PPG400, Ultraric PE62, Pluronic L64, Pluronic L35, PEG400, PEG600, and PEG1000. Density (ρ) and refractive index (n) were measured for the whole range of w1 at T = 293.2 K. Correlation with Redlich-Kister equation and prediction with Lorentz-Lorenz theoretical model were done. pH was measured for different mass fractions at ambient temperature (T ≈ 298.2 K). Cloud point temperature (Tcloud) was measured for different polymer mass fractions (w1) from 0.02 up to 0.30. The thermal expansion coefficient (αT) was calculated for w1 = 0.15 and temperature (T) from 278.2 up to 348.2 K. Experiments were conducted at atmospheric pressure (P ≈ 95 kPa). The obtained thermophysical properties indicate that PEGs + water have the highest ρ while PPG400 + water has the smallest ρ. Also, all ρ vs w1 curves present a maximum value. n profiles are similar for all systems, showing the same refractive index increment for w1 below 0.4. Density (Δρ) and refractive index (Δn) deviations are higher for the PPG400 + water system, mainly due to the highest propylene content and hydrophobic character of PPG units. Moreover, pH varies with polymer mass fraction reaching a minimum value, probably because polymers release H+ in solution. Phase transition results indicate that Tcloud and αT present related behaviors, i.e., when solution became turbid, αT shows an abrupt change in slope.-
Descrição: dc.descriptionSchool of Chemical Engineering University of Campinas, Av. Albert Einstein 500, São Paulo-
Descrição: dc.descriptionDepartment of Engineering Physics and Mathematics Institute of Chemistry of Araraquara São Paulo State University, Prof. Francisco Degni Street 55, São Paulo-
Descrição: dc.descriptionDepartment of Engineering Physics and Mathematics Institute of Chemistry of Araraquara São Paulo State University, Prof. Francisco Degni Street 55, São Paulo-
Formato: dc.format2959-2975-
Idioma: dc.languageen-
Relação: dc.relationJournal of Chemical and Engineering Data-
???dc.source???: dc.sourceScopus-
Título: dc.titleDensity, Refractive Index, pH, and Cloud Point Temperature Measurements and Thermal Expansion Coefficient Calculation for PPG400, PE62, L64, L35, PEG400, PEG600, or PEG1000+ Water Systems-
Tipo de arquivo: dc.typelivro digital-
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