| Texto completo | |
| Autor(es): |
Franco, D. F.
;
Barud, H. S.
;
Santagneli, S.
;
Lamarca, R. S.
;
Santos, Bruno F.
;
Silva, M. A. P.
;
de Oliveira, L. F. C.
;
Ribeiro, S. J. L.
;
Nalin, M.
Número total de Autores: 9
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Materials Chemistry and Physics; v. 180, p. 114-121, SEP 1 2016. |
| Citações Web of Science: | 2 |
| Resumo | |
This paper describes the preparation of Sodium Polyphosphates Coacervates (NaPC) through the direct addition of different methanol molar fractions to a sodium polyphosphate solution. The presence of methanol reduces the dielectric constant medium and it promotes the coacervate formation. Rheology measurement shows that the NaPC viscosity is dependent on a methanol molar fraction, which is caused by the dielectric constant reduction of the water-methanol mixture. Raman spectra for the lyophilized NaPC show that the symmetric P-O-t stretching mode is more sensitive than the symmetric P-O-b stretching mode, due to the approach of the adjacent polyphosphate chains. The P-31 NMR spectra also confirm a decrease in the Q(2)/Q(1) ratio because of the methanol content. Besides, we have obtained transparent soft Glass-Materials to melt NaPC at 800 degrees C. (C) 2016 Elsevier B.V. All rights reserved. (AU) | |
| Processo FAPESP: | 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros |
| Beneficiário: | Edgar Dutra Zanotto |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |