Regular oligomer molecule

Smallest constitutional unit, the repetition of which constitutes a regular macromolecule, a regular oligomer molecule, a regular block, or a regular chain. 

Figure 2.1 shows that on all the curves at a certain concentration of surfactant there is a distinct kink after which the surface tension of the solution becomes independent of the surfactant concentration. This is likely related to the formation of micelles of the surfactant molecules that occurs at the surfactant concentration equal to CCMF (the critical concentration for micelle formation). Thus, the surfactant solutions in the oligomers are subject to the same regularities as those in other solvents. For the OP-10 solutions in DEG-1 two kinks are observed on the isotherm the kink at the lower surfactant concentration is usually related to preassociation. 

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