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Abstract
ABSTRACT Ethoxylated oleyl alcohol or esters and its selected derivatives were found to behave abnormally in aqueous solutions. It has been demonstrated that when plotting Jin CMC versus ethylene oxide (EO) units of the unsaturated compounds, negative slopes are obtained, while positive slopes are expected for the corresponding saturated surfactants.
Preparation of dihydroxy-, dichloro- and dibromostearyl ethers or esters of ethoxylated surfactants and selected polyglycerol esters confirmed these anomalies.
It has been shown also that no common intercept could be expected for such compounds at zero EO units
An explanation based on steric hindrance of the surfactant on micelle packing is proposed.