Analysis of fluorinated surfactant in multicomponent systems by ~(19)F NMR

The traditional surfactant can not replace the important role of fluorinated surfactant in some special areas with their unique property.It is systematically to set up a complete set of 19F NMR,1H NMR,13 C NMR spectrums of NMR spectra atlas.The spectra atlas contains more than 100 organic fluorine-containing compounds,and spectrums were collected from experimental results or references.The changing regularity of chemical shifts and coupling constants of various organic fluoride 19F NMR was studied systematically by typical examples.In order to analysis the fluorinated surfactant,it is an urgent need to establish a new analysis method of 19F NMR.The efficient method for the identification of multicomponent fluorinated surfactant mixtures were investigated in detail by five enterprise samples.The characteristic peaks in the 19F NMR spectra of fluorinated surfactant were assigned.The results showed that,19F NMR has the advantages of rapidity,accuracy,high resolution,less interference,and 19F NMR can only detect fluorine-containing compounds.The fluorinated surfactant components were united closely around 19F NMR analysis and attached to 1 H NMR or 13 C NMR analysis.Sometimes complex system need to attach to other helpful analytic technique.Therefore,the experimental results confirmed that 19F NMR spectroscopy can be used to quantify the structures of fluorinated surfactant in multicomponent systems.