Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/90818
Type: Artigo de periódico
Title: Fractional Precipitation Of Sodium Polyphosphate And Characterization By 31p Nmr: An Experiment For Pysical Chemistry Classes [fracionamento De Polifosfato De Sódio E Caracterização Por Rmn De 31p: Um Experimento Para Aulas De Físico- Química]
Author: De Oliveira Lima E.C.
Alcantara G.B.
Damasceno F.C.
Neto J.M.M.
Galembeck F.
Abstract: 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 31P 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.
Editor: 
Rights: aberto
Identifier DOI: 10.1590/S0100-40422010000900031
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-79951642811&partnerID=40&md5=eb7a1d2a802e1c5f69ee1b1eb854b456
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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