Fractional precipitation of sodium polyphosphate and characterization by 31P 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 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.1991199

Nanocompósitos magnéticos hidrofóbicos a base de polímeros reticulados porosos/óxidos de ferro e seu processo de preparação

Em 06/10/2016: Restauração de pedido, patente ou certificado de adição de invenção.ConcedidaA presente invenção compreende a preparação de nanocompósitos magnéticos a base de polímeros reticulados porosos/óxidos de ferro, com alta hidrofobicidade, resultando em fluidos magnetoreológicos que permitam recuperar, por separação magnética, óleos dispersos superficialmente em meios líquidos, como, por exemplo, resultando de derramamentos acidentais

Fracionamento de polifosfato de sódio e caracterização por RMN de 31P: um experimento para aulas de físico-química

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