Mixed Systems Of Fluorinated And Hydrogenated Nonionic Surfactants - The Air Water Adsorbed Film And Micelles

In mixing nonionic fluorinated and hydrogenated surfactants and depending on the dissymetry in their EO chain length, one or several types of mixed aggregated structures can be obtained. The compositions of the air/water adsorbed film and of the micelles are compared as a function of the composition of the monomers in the bulk, showing very different competing adsorbability for each of the components, depending on the EO chain length. At constant hydrophobic (fluorinated and hydrogenated) tails, the mixing in the aggregates may be almost ideal or noticeably nonideal, the mutual phobicity being markedly enhanced by the dissymetry in the hydrophilic chains. The mixing in the adsorbed film is practically always ideal.