Atenção: Todas as denúncias são sigilosas e sua identidade será preservada.
Os campos nome e e-mail são de preenchimento opcional
Metadados | Descrição | Idioma |
---|---|---|
Autor(es): dc.contributor | Universidade Estadual de Campinas (UNICAMP) | - |
Autor(es): dc.contributor | Universidade Estadual Paulista (UNESP) | - |
Autor(es): dc.creator | De Oliveira, Leonardo H. | - |
Autor(es): dc.creator | Pinto, Rafaela R. | - |
Autor(es): dc.creator | Monteiro Filho, Elias De S. [UNESP] | - |
Autor(es): dc.creator | Aznar, Martín | - |
Data de aceite: dc.date.accessioned | 2022-08-04T22:10:34Z | - |
Data de disponibilização: dc.date.available | 2022-08-04T22:10:34Z | - |
Data de envio: dc.date.issued | 2022-04-28 | - |
Data de envio: dc.date.issued | 2022-04-28 | - |
Data de envio: dc.date.issued | 2021-08-12 | - |
Fonte completa do material: dc.identifier | http://dx.doi.org/10.1021/acs.jced.0c01092 | - |
Fonte completa do material: dc.identifier | http://hdl.handle.net/11449/222019 | - |
Fonte: dc.identifier.uri | http://educapes.capes.gov.br/handle/11449/222019 | - |
Descrição: dc.description | Thermophysical 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.description | School of Chemical Engineering University of Campinas, Av. Albert Einstein 500, São Paulo | - |
Descrição: dc.description | Department of Engineering Physics and Mathematics Institute of Chemistry of Araraquara São Paulo State University, Prof. Francisco Degni Street 55, São Paulo | - |
Descrição: dc.description | Department of Engineering Physics and Mathematics Institute of Chemistry of Araraquara São Paulo State University, Prof. Francisco Degni Street 55, São Paulo | - |
Formato: dc.format | 2959-2975 | - |
Idioma: dc.language | en | - |
Relação: dc.relation | Journal of Chemical and Engineering Data | - |
???dc.source???: dc.source | Scopus | - |
Título: dc.title | 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 | - |
Tipo de arquivo: dc.type | livro digital | - |
Aparece nas coleções: | Repositório Institucional - Unesp |
O Portal eduCAPES é oferecido ao usuário, condicionado à aceitação dos termos, condições e avisos contidos aqui e sem modificações. A CAPES poderá modificar o conteúdo ou formato deste site ou acabar com a sua operação ou suas ferramentas a seu critério único e sem aviso prévio. Ao acessar este portal, você, usuário pessoa física ou jurídica, se declara compreender e aceitar as condições aqui estabelecidas, da seguinte forma: