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Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064


MANSUR, Claudia R. E.; LUCAS, Elizabete F.; PACHECO, Carlos R. N.  and  GONZALEZ, Gaspar. Surfactant/hydrotrope interaction in aqueous systems by nuclear magnetic resonance oxide), hydrotropy, nuclear magnetic resonance. Quím. Nova [online]. 2001, vol.24, n.1, pp.47-54. ISSN 0100-4042.

In this work, it was studied the behavior of the nonionic surfactant aqueous solutions, containing or not a hydrotropic agent, by resonance magnetic nuclear (NMR). We have studied monofunctional diblock copolymers of poly(propylene oxide-ethylene oxide) (R-PPO-PEO-OH, where R length is linear C4) as nonionic surfactant and sodium p-toluenesulfonate (NaPTS) as hydrotropic agent. The critical micelle concentration (CMC) of the aqueous copolymer solution was obtained from 1H-NMR. The preliminary study of the interaction between the copolymer, under the unimer and micelle forms, and the hydrotrope, in aqueous solutions, was evaluated by 1H-NMR and 13C-NMR.

Keywords : surfactants; block copolymers; poly(propylene oxide-b-ethylene oxide); hydrotropy; nuclear magnetic resonance.

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