Synthesis and Behavior at the Air-Water Interface of Fluorinated Nonionic Surfactants Containing Two Methylated Polyoxyethylene Moieties.
The nonionic surfactants of the type polyoxyethylated monomethylated and containing a fluorinated tail were synthesized from 2-(F-alkyl)ethylamines. These compounds have two polyethoxylated tails with a perfectly defined number of oxyethylene motifs. Compared with their bipodal homologs within the F-alkylated series, these new structures were easily obtained from commercial raw materials which are the 2-(F-alkyl)ethyliodides. The evaluation of their behavior at the air-water interface has been studied from measurements of surface tension versus variation of concentration. This clearly shows the variation of the critical micelle concentration (c.m.c.) from 1.0.10(-5) to 2.5.10(-3) mol.liter(-1) and of the surface area per surfactant molecule versus studied structure. The N,N-dipolyethoxylene methoxyether of 2-(F-alkyl)ethylamines so realized exhibit noteworthy properties as nonionic fluorinated surfactants.
Guittard
F
Laboratoire de Chimie Organique du Fluor, Faculté des Sciences, Université de Nice-Sophia Antipolis, B.P. No. 71, Nice, 06108 Cedex 2, France
de Givenchy ET
Cambon
A