HYBRID SURFACTANTS CONTAINING SEPARATE HYDROCARBON AND FLUOROCARBON CHAINS

Two homologous series of double-tail hybrid surfactants containing a hydrocarbon chain and a fluorocarbon chain attached to the same hydrophilic head group have been synthesized. The micellar solutions of such hybrid surfactants have been studied by conductance, surface tension, F-19 NMR and H-1 NMR. The dependence of the cmc on the chain length follows Kleven's equation. The micellar aggregation numbers are 10-35 and become smaller as the chain length increases. When the hydrocarbon chain bears three carbons or more, both the fluorocarbon and the hydrocarbon chains are incorporated inside the micelle.