Preparation and structural characterization of sodium polyphosphate coacervate as a precursor for optical materials

Made available in DSpace on 2018-12-11T17:23:06Z (GMT). No. of bitstreams: 0 Previous issue date: 2016-09-01 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. Institute of Chemistry – São Paulo State University – Unesp, P.O. Box 355 Laboratório de Biopolímeros e Biomateriais (BioPolMat) – Centro Universitário de Araraquara (UNIARA) Núcleo de Espectroscopia e Estrutura Molecular – NEEM Departamento de Química Instituto de Ciências Exatas Universidade Federal de Juiz de Fora NUPIS (Núcleo de Pesquisa em Instrumentação e Separações Analíticas) Departamento de Química Instituto de Ciências Exatas Universidade Federal de Juiz de Fora School of Pharmaceutical Sciences São Paulo State University – UNESP Institute of Chemistry – São Paulo State University – Unesp, P.O. Box 355 School of Pharmaceutical Sciences São Paulo State University – UNESP