Preparation and structural characterization of sodium polyphosphate coacervate as a precursor for optical materials
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2016-09-01
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Franco, D. F. [UNESP]
Barud, H. S.
Santagneli, S. [UNESP]
Lamarca, R. S.
Santos, Bruno F. [UNESP]
Silva, M. A.P.
de Oliveira, L. F.C.
Ribeiro, S. J.L. [UNESP]
Nalin, M. [UNESP]
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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-Ot stretching mode is more sensitive than the symmetric P-Ob stretching mode, due to the approach of the adjacent polyphosphate chains. The 31P NMR spectra also confirm a decrease in the Q2/Q1 ratio because of the methanol content. Besides, we have obtained transparent soft Glass-Materials to melt NaPC at 800 °C.
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Coacervates, Glasses, Nuclear magnetic resonance (NMR), Optical properties
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Materials Chemistry and Physics, v. 180, p. 114-121.