Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/67103
Type: Artigo de periódico
Title: FRACTIONAL PRECIPITATION OF SODIUM POLYPHOSPHATE AND CHARACTERIZATION BY P-31 NMR: AN EXPERIMENT FOR PYSICAL CHEMISTRY CLASSES.
Author: Lima, ECD
Alcantara, GB
Damasceno, FC
Neto, JMM
Galembeck, F
Abstract: FRACTIONAL PRECIPITATION OF SODIUM POLYPHOSPHATE AND CHARACTERIZATION BY P-31 NMR: AN EXPERIMENT FOR PYSICAL CHEMISTRY CLASSES. This text describes an experiment on fractional precipitation of a polymer together with determination of average degree of polymerization by NMR. Commercial sodium polyphosphate was fractionated by precipitation from aqueous solution by adding increasing amounts of acetone. The polydisperse salt and nine fractions obtained from it were analyzed by P-31 Nuclear Magnetic Resonance and the degree of polymerization of the salts and of the fractions were calculated. Long-chain sodium polyphosphate was also synthesized and analyzed. This experiment was tested in a PChem lab course but it can be used also to illustrate topics of inorganic polymers and analytical chemistry.
Subject: sodium polyphosphate
fractional precipitation
P-31 NMR
Country: Brasil
Editor: Soc Brasileira Quimica
Rights: aberto
Identifier DOI: 10.1590/S0100-40422010000900031
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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