Abstract
19F NMR measurements on lithium perfluorononanoate [LiPFN] in D2O and in solutions of D2O with poly(vinylpyrrolidone) [PVP] at different molecular weights have been carried out. A careful study of literature data and COSY maps allowed the full assignment of the 19F resonances as a function of concentration and composition of the systems. For the LiPFN/D2O system, analysis of the chemical shifts of the fluorine atoms bound to the different carbons of the LiPFN backbone reveals significant variations correlated to the LiPFN concentration. Such a finding has been explained in terms of the changes in the local dielectric constant caused by the surfactant self-aggregation process. The presence of PVP in solution strongly modifies the trend of the 19F chemical shifts observed in the binary LiPFN/D2O system. Such a feature, depending both on the position of the fluorine atoms along the surfactant backbone and on the LiPFN concentration, indicates the presence of strong polymer−surfactant interactions. The line w...
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