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

Química Nova

Emília Celma De Oliveira Lima²  Glaucia Braz Alcantara²  Fernando Cruvinel Damasceno²  José Machado Moita Neto¹  Fernando Galembeck¹ 

[1] ,Universidade Federal de Goiás Instituto de Química Goiânia GO ,Brasil

关键词: sodium polyphosphate;    fractional precipitation;    31P NMR;   

DOI  :  10.1590/S0100-40422010000900031

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY-NC   
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